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Jiang RW, Marin LM, Jaroch K, Zhou W, Siqueira WL, Pawliszyn J. Proteomic Analysis of Human Saliva via Solid-Phase Microextraction Coupled with Liquid Chromatography-Mass Spectrometry. Anal Chem 2024; 96:5363-5367. [PMID: 38535996 DOI: 10.1021/acs.analchem.4c00307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Proteomics of human saliva samples was achieved for the first time via biocompatible solid-phase microextraction (bio-SPME) devices. Upon introduction of a porogen to a conventional C18 coating, porous C18/polyacrylonitrile (PAN) SPME blades were able to extract peptides up to 3.0 kDa and more peptides than commercial SPME blades. Following Trypsin digestion, salivary proteomic analysis was achieved via SPME-LC-MS/MS. Seven endogenous proteins were consistently identified in all saliva samples via bio-SPME. Taking advantage of this strategy, untargeted peptidomics was applied for the comparison of saliva samples between healthy and SARS-CoV-2 positive individuals. The results showed clear peptidomic differences between the viral and healthy saliva samples. This proof-of-concept study demonstrates the potential of bio-SPME-LC-MS/MS for peptidomics and proteomics in biomedical applications.
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Affiliation(s)
- Runshan W Jiang
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Lina M Marin
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada
| | - Karol Jaroch
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Department of Pharmacodynamics and Molecular Pharmacology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, Bydgoszcz 85-089, Poland
| | - Wei Zhou
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada
| | - Janusz Pawliszyn
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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Ahmad P, Siqueira WL. Mass spectrometry-based proteomics profiling of dogs with and without oral diseases: a systematic review. BMC Oral Health 2024; 24:369. [PMID: 38519930 PMCID: PMC10958906 DOI: 10.1186/s12903-024-04096-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 03/04/2024] [Indexed: 03/25/2024] Open
Abstract
BACKGROUND Understanding the distinct proteomics profiles in dogs' oral biofluids enhances diagnostic and therapeutic insights for canine oral diseases, fostering cross-species translational research in dentistry and medicine. This study aimed to conduct a systematic review to investigate the similarities and differences between the oral biofluids' proteomics profile of dogs with and without oral diseases. METHODS PubMed, Web of Science, and Scopus were searched with no restrictions on publication language or year to address the following focused question: "What is the proteome signature of healthy versus diseased (oral) dogs' biofluids?" Gene Ontology enrichment and the Kyoto Encyclopedia of Genes and Genomes pathway analyses of the most abundant proteins were performed. Moreover, protein-protein interaction analysis was conducted. The risk of bias (RoB) among the included studies was assessed using the Joanna Briggs Institute (JBI) Critical Appraisal Checklist for Studies Reporting Prevalence Data. RESULTS In healthy dogs, the proteomic analysis identified 5,451 proteins, with 137 being the most abundant, predominantly associated with 'innate immune response'. Dogs with oral diseases displayed 6,470 proteins, with distinct associations: 'defense response to bacterium' (periodontal diseases), 'negative regulation of transcription' (dental calculus), and 'positive regulation of transcription' (oral tumors). Clustering revealed significant protein clusters in each case, emphasizing the diverse molecular profiles in health and oral diseases. Only six studies were provided to the JBI tool, as they encompassed case-control evaluations that compared healthy dogs to dogs with oral disease(s). All included studies were found to have low RoB (high quality). CONCLUSION Significant differences in the proteomics profiles of oral biofluids between dogs with and without oral diseases were found. The synergy of animal proteomics and bioinformatics offers a promising avenue for cross-species research, despite persistent challenges in result validation.
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Affiliation(s)
- Paras Ahmad
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada.
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Ahmad P, Marin LM, Lowe C, Katselis GS, Siqueira WL. Salivary protein homology between humans and dogs: Mass spectrometry-based proteomics analysis. J Dent 2024; 142:104855. [PMID: 38246308 DOI: 10.1016/j.jdent.2024.104855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 01/16/2024] [Accepted: 01/18/2024] [Indexed: 01/23/2024] Open
Abstract
OBJECTIVE This benchmark study aimed to investigate sex-related differences based on the identification and characterization of the salivary proteome of healthy male and female dogs using mass spectrometry (MS) technique and a homology-driven approach to analyze salivary proteins in both human and dog species utilizing protein sequence alignment technique. METHODS Unstimulated whole saliva was collected from 10 healthy Beagles. After processing the samples and determining the total protein content, in-solution protein digestion was performed involving denaturation, reduction of disulfide bonds, alkylation, and removal of interfering compounds. Samples were analyzed using LC-ESI-MS/MS. RESULTS LC-ESI-MS/MS analysis identified 327 and 341 unique proteins in male and female dog saliva, respectively, of which 318 (97.25 %) in male dogs and 326 (95.60 %) in female dogs were characterized. Abundant shared proteins included albumin, BPI fold-containing family A member 2, and VWFD domain-containing protein. A notable uncharacterized protein, VWFD domain-containing protein, was among the most abundant in both sexes. Comparative analysis of 69 abundant shared proteins indicated an upregulation of CES5A, EFHD, GC, IGHM, LOC100653049, KRT10, LCP1, PGD, TPI1 in male dogs, while LOC100855593 was upregulated in female dogs. In total, 84 % (n = 229/274) and 86 % (n = 235/275) salivary proteins identified in male and female dogs, respectively, were homologous to human proteins, with an overall homology of 86 % (n = 364/423), including 15 with 100 % homology. CONCLUSION The study revealed clear differences in the salivary proteomics profile of healthy male and female dogs. However, most of the salivary proteins in both male and female dogs showed homology with human salivary proteins. CLINICAL RELEVANCE The identification of unique salivary proteome profiles in male and female dogs, coupled with substantial homology to human proteins, provides promising biomarkers for health assessment, highlighting its clinical significance for diagnostics and therapeutic exploration not only in veterinary and human dentistry, but across mammalian species.
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Affiliation(s)
- Paras Ahmad
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N E5E, Canada
| | - Lina M Marin
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N E5E, Canada
| | - Candace Lowe
- Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - George S Katselis
- Department of Medicine, Canadian Centre for Rural and Agricultural Health, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan S7N 2Z4, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N E5E, Canada.
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Dias LM, Cilli EM, Medeiros KS, Brasil MCODA, Marin LM, Siqueira WL, Pavarina AC. Antibiofilm Activity and Biocompatibility of Temporin-SHa: A Promising Antimicrobial Peptide for Control of Fluconazole-Resistant Candida albicans. Microorganisms 2024; 12:99. [PMID: 38257927 PMCID: PMC10818419 DOI: 10.3390/microorganisms12010099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 12/22/2023] [Accepted: 12/29/2023] [Indexed: 01/24/2024] Open
Abstract
The aim of the study was to investigate the effect of antimicrobial peptides (AMPs) Hylin-a1, KR-12-a5, and Temporin-SHa in Candida albicans as well as the biocompatibility of keratinocytes spontaneously immortalized (NOK-si) and human gingival fibroblasts (FGH) cells. Initially, the susceptible (CaS-ATCC 90028) and fluconazole-resistant (CaR-ATCC 96901) C. albicans strains were grown to evaluate the effect of each AMP in planktonic culture, biofilm, and biocompatibility on oral cells. Among the AMPs evaluated, temporin-SHa showed the most promising results. After 24 h of Temporin-SHa exposure, the survival curve results showed that CaS and CaR suspensions reduced 72% and 70% of cell viability compared to the control group. The minimum inhibitory/fungicide concentrations (MIC and MFC) showed that Temporin-SHa was able to reduce ≥50% at ≥256 µg/mL for both strains. The inhibition of biofilm formation, efficacy against biofilm formation, and total biomass assays were performed until 48 h of biofilm maturation, and Temporin-SHa was able to reduce ≥50% of CaS and CaR growth. Furthermore, Temporin-SHa (512 µg/mL) was classified as non-cytotoxic and slightly cytotoxic for NOK-si and FGH, respectively. Temporin-SHa demonstrated an anti-biofilm effect against CaS and CaR and was biocompatible with NOK-si and FGH oral cells in monolayer.
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Affiliation(s)
- Luana Mendonça Dias
- Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University (UNESP), Araraquara 16015-050, Brazil; (L.M.D.); (K.S.M.)
- College of Dentistry, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada;
| | - Eduardo Maffud Cilli
- Department of Biochemistry and Organic Chemistry, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, Brazil; (E.M.C.); (M.C.O.d.A.B.)
| | - Karine Sousa Medeiros
- Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University (UNESP), Araraquara 16015-050, Brazil; (L.M.D.); (K.S.M.)
| | - Maria Carolina Oliveira de Arruda Brasil
- Department of Biochemistry and Organic Chemistry, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, Brazil; (E.M.C.); (M.C.O.d.A.B.)
| | - Lina Maria Marin
- College of Dentistry, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada;
| | - Walter L. Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada;
| | - Ana Claudia Pavarina
- Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University (UNESP), Araraquara 16015-050, Brazil; (L.M.D.); (K.S.M.)
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Siqueira MF, Da Silva K, Rocchi M, Siqueira WL. e-Prescribing in pediatric dentistry: Lessons learned from e-learning module incorporation. J Dent Educ 2023; 87 Suppl 3:1873-1875. [PMID: 37452827 DOI: 10.1002/jdd.13334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 06/27/2023] [Accepted: 06/30/2023] [Indexed: 07/18/2023]
Affiliation(s)
- Michelle F Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Keith Da Silva
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Marie Rocchi
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Khanna M, Allison P, Farmer J, Quiñonez C, Glogauer M, Siqueira WL, Rock LD, McNally M, Madathil S. Personal protective equipment during COVID-19: A natural history of dental and dental hygiene regulatory guidance in Canada. J Am Dent Assoc 2023; 154:1077-1086.e8. [PMID: 38008525 DOI: 10.1016/j.adaj.2023.09.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 08/12/2023] [Accepted: 09/02/2023] [Indexed: 11/28/2023]
Abstract
BACKGROUND Due to the evolving nature of COVID-19, there is evidence that COVID-19-specific infection prevention and control guideline (IPCG) documents formulated for oral health care settings are also changing rapidly. To better inform future policies, a comprehensive review of all IPCG documents across different phases of restrictions for oral health care practitioners is required. TYPES OF STUDIES REVIEWED A search was performed for documents shared from March 2020 through January 2022 on websites of oral health regulatory authorities in Canada's 10 provinces and 3 territories. The authors performed a narrative review of the identified IPCG documents for dentists (n = 78) and dental hygienists (n = 57). RESULTS Overall findings from more than 100 IPCG documents distributed during a period of 23 months revealed that the frequency of these updates differed among jurisdictions and between the 2 oral health care practitioners (ie, dentists and dental hygienists) within the same jurisdiction. The most notable observation was the different face-covering recommendations for dentists and dental hygienists within the same jurisdiction during the same timeframe. A common document was sometimes observed for dentists and dental hygienists, however, most jurisdictions had separate IPCG documents. CONCLUSIONS AND PRACTICAL IMPLICATIONS The different approaches could have been justified on the basis of prevalence of COVID-19 and availability of personal protective equipment; however, there was a risk of creating confusion about IPCG best practices. The findings of this review will support decision makers when planning future development and dissemination of regulations for all oral health care practitioners.
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Seth R, Madathil SA, Siqueira WL, McNally M, Quiñonez CR, Glogauer M, Allison PJ. Validity and reliability of the COVID-19 Anxiety Syndrome Scale in Canadian dentists. Clin Psychol Psychother 2023; 30:1349-1356. [PMID: 37337746 DOI: 10.1002/cpp.2877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/31/2023] [Accepted: 06/08/2023] [Indexed: 06/21/2023]
Abstract
BACKGROUND The COVID-19 pandemic has resulted in a high level of mental health problems for the population worldwide including healthcare workers. Several studies have assessed these using measurements for anxiety for general populations. The COVID-19 Anxiety Syndrome Scale (C-19ASS) is a self-report measure developed to assess maladaptive forms of coping with COVID-19 (avoidance, threat monitoring and worry) among a general adult population in the United States. We used it in a prospective cohort study of COVID-19 incidence rates in practising Canadian dentists. We therefore need to ensure that it is valid for dentists in French and English languages. This study aimed to evaluate the validity of the C-19ASS in that population. METHODS Cross-sectional data from the January 2021 monthly follow-up in our prospective cohort study were used. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were performed. RESULTS The results of EFA revealed a 2-factor structure solution that explained 47% of the total variance. The CFA showed a good model fit on the data in both English and French languages. The Cronbach's alpha indicated acceptable levels of reliability. Furthermore, the C-19ASS showed excellent divergent validity from the Generalized Anxiety Disorder-7 (GAD-7) scale. CONCLUSIONS The C-19ASS is valid and reliable instrument to measure COVID-19-related anxiety in English and French among Canadian dentists. PRACTICAL IMPLICATIONS This validated measure will contribute to understanding of the mental health impact of the pandemic on dentists in Canada and enable the dental regulatory authorities and organizations to intervene to help dentists.
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Affiliation(s)
- Rachita Seth
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Sreenath A Madathil
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Mary McNally
- Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Carlos R Quiñonez
- Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Michael Glogauer
- Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | - Paul J Allison
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Quebec, Canada
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8
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Siqueira WL, Greig L. Brewing better connections: Coffee with the dean to enhance admin-student communication. J Dent Educ 2023. [PMID: 37572689 DOI: 10.1002/jdd.13362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 07/17/2023] [Accepted: 07/27/2023] [Indexed: 08/14/2023]
Abstract
Effective communication is pivotal in nurturing a supportive learning atmosphere. At the University of Saskatchewan's College of Dentistry, traditional methods like emails and meetings seemed inadequate in engaging all students. Concerns stemmed from power dynamics and limited dialogue avenues. To bridge this gap, an innovative solution emerged. Introducing "Coffee with the Dean": A bi-weekly event fostering informal discussions between students and the dean. Set in a relaxed ambiance, students openly covered diverse topics. The project aimed to foster transparent communication and bolster a sense of unity. Implemented over six months, the initiative saw significant outcomes. Assessment involved an anonymous survey to DMD students, garnering a 34% response rate. Impressively, 89% acknowledged enhanced communication, with 53% and 23% expressing high and moderate satisfaction in asking questions and providing feedback. Moreover, 67% displayed a likelihood to attend future sessions. A notable 89% appreciated the project's community-building impact. Although challenges emerged, including scheduling and participation constraints, the project achieved its goal. The casual setup facilitated student expression and prompted insightful exchanges. The experience emphasizes the importance of secure dialogue spaces and consistent communication channels. "Coffee with the Dean" stands as a potent tool for heightened student-administration interaction. Its role in elevating communication aligns with the quest for educational excellence, ensuring holistic student growth.
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Affiliation(s)
| | - Lisa Greig
- College of Dentistry, University of Saskatchewan, Saskatoon, Canada
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Marin LM, Katselis GS, Chumala P, Sanche S, Julseth L, Penz E, Skomro R, Siqueira WL. Identification of SARS-CoV-2 biomarkers in saliva by transcriptomic and proteomics analysis. Clin Proteomics 2023; 20:30. [PMID: 37537537 PMCID: PMC10398966 DOI: 10.1186/s12014-023-09417-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 06/20/2023] [Indexed: 08/05/2023] Open
Abstract
The detection of SARS-CoV-2 biomarkers by real time PCR (rRT-PCR) has shown that the sensitivity of the test is negatively affected by low viral loads and the severity of the disease. This limitation can be overcome by the use of more sensitive approaches such as mass spectrometry (MS), which has not been explored for the detection of SARS-CoV-2 proteins in saliva. Thus, this study aimed at assessing the translational applicability of mass spectrometry-based proteomics approaches to identify viral proteins in saliva from people diagnosed with COVID-19 within fourteen days after the initial diagnosis, and to compare its performance with rRT-PCR. After ethics approval, saliva samples were self-collected by 42 COVID-19 positive and 16 healthy individuals. Samples from people positive for COVID-19 were collected on average on the sixth day (± 4 days) after initial diagnosis. Viable viral particles in saliva were heat-inactivated followed by the extraction of total proteins and viral RNA. Proteins were digested and then subjected to tandem MS analysis (LC-QTOF-MS/MS) using a data-dependent MS/MS acquisition qualitative shotgun proteomics approach. The acquired spectra were queried against a combined SARS-CoV-2 and human database. The qualitative detection of SARS-CoV-2 specific RNA was done by rRT-PCR. SARS-CoV-2 proteins were identified in all COVID-19 samples (100%), while viral RNA was detected in only 24 out of 42 COVID-19 samples (57.1%). Seven out of 18 SARS-CoV-2 proteins were identified in saliva from COVID-19 positive individuals, from which the most frequent were replicase polyproteins 1ab (100%) and 1a (91.3%), and nucleocapsid (45.2%). Neither viral proteins nor RNA were detected in healthy individuals. Our mass spectrometry approach appears to be more sensitive than rRT-PCR for the detection of SARS-CoV-2 biomarkers in saliva collected from COVID-19 positive individuals up to 14 days after the initial diagnostic test. Based on the novel data presented here, our MS technology can be used as an effective diagnostic test of COVID-19 for initial diagnosis or follow-up of symptomatic cases, especially in patients with reduced viral load.
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Affiliation(s)
- Lina M Marin
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, S7N 5E5, Canada
| | - George S Katselis
- Canadian Centre for Health and Safety in Agriculture, Department of Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 2Z4, Canada
| | - Paulos Chumala
- Canadian Centre for Health and Safety in Agriculture, Department of Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 2Z4, Canada
| | - Stephen Sanche
- Division of Infectious Diseases, Department of Medicine, and Department of Pathology and Laboratory Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 0X8, Canada
| | - Lucas Julseth
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, S7N 5E5, Canada
- Canadian Centre for Health and Safety in Agriculture, Department of Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 2Z4, Canada
| | - Erika Penz
- Division of Respirology, Critical Care and Sleep Medicine, Department of Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 0X8, Canada
| | - Robert Skomro
- Division of Respirology, Critical Care and Sleep Medicine, Department of Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 0X8, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, S7N 5E5, Canada.
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Moussa DG, Kung RW, Tse JS, Siqueira WL. Mechanistic Insights into Bioengineered Antibiofilm Enamel Pellicles. J Dent Res 2023:220345231162336. [PMID: 37082872 DOI: 10.1177/00220345231162336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023] Open
Abstract
Dental caries remains the most widespread chronic disease worldwide. Basically, caries originates within biofilms accumulated on dental enamel. Despite the nonrenewable nature of the enamel tissue, targeted preventive strategies are still very limited. We previously introduced customized multifunctional proteinaceous pellicles (coatings) for controlling bacterial attachment and subsequent biofilm succession. Stemmed from our whole proteome/peptidome analysis of the in vivo acquired enamel pellicle, we designed these pellicles using hybrid mixtures of the most abundant and complementary-acting antimicrobial and antifouling proteins/peptides for synergetic suppression of early biofilms. In conjugating these domains synthetically, their bioinhibitory efficacy was remarkably boosted. Herein, we sought to explore the key structure-function relationship of these potent de novo hybridized conjugates in comparison with their individual domains, solely or in physical mixtures. Specifically, we interrelated the following facets: physicochemical and 3-dimensional folding characteristics via molecular dynamics simulations, adopted secondary structure by circular dichroism, immobilization capacity on enamel through high-spatial resolution multiphoton microscopy, and biofilm suppression potency. Our data showed consistent associations among the increased preference for protein folding structures, α-helix content, and enamel-immobilization capacity; all were inversely correlated with the attached bioburden. The expressed phenotypes could be explained by the adopted strongly amphipathic helical conformation upon conjugation, mediated by the highly anionic and acidic N-terminal pentapeptide shared region/motif for enhanced immobilization on enamel. In conclusion, conjugating bioactive proteins/peptides is a novel translational approach to engineer robust antibiofilm pellicles for caries prevention. The adopted α-helical conformation is key to enhance the antibiofilm efficacy and immobilization capacity on enamel that are promoted by certain physicochemical properties of the constituent domains. These data are valuable for bioengineering versatile therapeutics to prevent/arrest dental caries, a condition that otherwise requires invasive treatments with substantial health care expenditures.
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Affiliation(s)
- D G Moussa
- College of Dentistry, University of Saskatchewan, Saskatoon, Canada
| | - R W Kung
- Department of Physics and Engineering Physics, College of Art and Science, University of Saskatchewan, Saskatoon, Canada
| | - J S Tse
- Department of Physics and Engineering Physics, College of Art and Science, University of Saskatchewan, Saskatoon, Canada
| | - W L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Canada
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Ahmad P, Hussain A, Siqueira WL. Mass spectrometry-based proteomic approaches for salivary protein biomarkers discovery and dental caries diagnosis: A critical review. Mass Spectrom Rev 2022:e21822. [PMID: 36444686 DOI: 10.1002/mas.21822] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Dental caries is a multifactorial chronic disease resulting from the intricate interplay among acid-generating bacteria, fermentable carbohydrates, and several host factors such as saliva. Saliva comprises several proteins which could be utilized as biomarkers for caries prevention, diagnosis, and prognosis. Mass spectrometry-based salivary proteomics approaches, owing to their sensitivity, provide the opportunity to investigate and unveil crucial cariogenic pathogen activity and host indicators and may demonstrate clinically relevant biomarkers to improve caries diagnosis and management. The present review outlines the published literature of human clinical proteomics investigations on caries and extensively elucidates frequently reported salivary proteins as biomarkers. This review also discusses important aspects while designing an experimental proteomics workflow. The protein-protein interactions and the clinical relevance of salivary proteins as biomarkers for caries, together with uninvestigated domains of the discipline are also discussed critically.
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Affiliation(s)
- Paras Ahmad
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Ahmed Hussain
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Ahmad P, Hussain A, Carrasco-Labra A, Siqueira WL. Salivary Proteins as Dental Caries Biomarkers: A Systematic Review. Caries Res 2022; 56:385-398. [PMID: 36116431 DOI: 10.1159/000526942] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 08/29/2022] [Indexed: 01/25/2023] Open
Abstract
Salivary proteins play an important role in repairing mechanisms of damaged tissues and the maintenance of oral health. However, there is a dearth of information in the literature regarding the concentrations of salivary proteins in caries-free (CF) and caries-active (CA) subjects. Hence, this systematic review was conducted to update our previous systematic review published in 2013 that aimed to assess the association between caries and salivary proteins by comparing CF and CA individuals. Thereby, evaluating the possibility of whether salivary proteins can be regarded as biomarkers for caries. An extensive search of studies was conducted using PubMed, EMBASE, Clarivate Analytics' Web of Science, and Elsevier's Scopus between July 2012 and January 2022, without any language restriction. Manual searching in Google Scholar and evaluation of bibliographies of the included studies were also undertaken. The Newcastle-Ottawa Scale was used to assess the risk of bias (RoB) within the included studies. Of 22 included studies, 1,551 human subjects (range: 30-213 participants) were recruited, of which 848 individuals (54.7%) were CA and 703 (45.3%) were CF. Regarding the utilization of DMFT as the caries index, high variability was observed across different articles. A statistically significant increase in the salivary levels of alpha-amylase, acidic proline-rich protein-1, histatin-5, lactoperoxidase, and mucin-1 was found in CA patients, while the salivary levels of carbonic anhydrase 6, proteinase-3, and statherin were observed to be significantly increased in CF subjects. Conflicting results were found regarding the salivary levels of immunoglobulin A and total proteins among CA and CF subjects. The included studies were categorized as low RoB (n = 15), medium RoB (n = 4), and high RoB (n = 3). Due to significant heterogeneity among the included studies, no meta-analysis could be performed. In conclusion, the salivary levels of protein(s) might be a useful biomarker for caries diagnosis, especially alpha-amylase, acidic proline-rich protein-1, histatin-5, lactoperoxidase, mucin-1, carbonic anhydrase 6, proteinase-3, and statherin. However, their diagnostic value must be verified by large-scale prospective studies.
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Affiliation(s)
- Paras Ahmad
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Ahmed Hussain
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Alonso Carrasco-Labra
- Center for Integrative Global Oral Health, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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13
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de Gutierrez GM, Marin LM, Xiao Y, Escalante-Herrera A, Santos MTBR, Siqueira WL. Detection of periodontal disease activity based on histatin degradation in individuals with cerebral palsy. Heliyon 2022; 8:e10134. [PMID: 36046535 PMCID: PMC9421316 DOI: 10.1016/j.heliyon.2022.e10134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 06/27/2022] [Accepted: 07/27/2022] [Indexed: 11/13/2022] Open
Abstract
Objectives This proof-of-concept study aimed at evaluating the proteolytic profile of histatin 1 and 5 in saliva of adolescents with spastic cerebral palsy (CP) with gingivitis. Methods This cross-sectional study included 24 individuals allocated into three groups: G1 (CP with gingivitis; n = 8), G2 (without CP and without gingivitis; n = 8), and G3 (without CP and with gingivitis; n = 8). The gingival index (GI) and simplified oral hygiene index (OHI–S) were evaluated. Whole saliva was collected and used to assess the rate and mode of histatin 1 and 5 at different times. The degradation products were visualized after cationic PAGE and the protein band densities (BDs) were compared with a protein standard. Fragmentation products were collected from the gel, pooled by group and characterized by mass spectrometry. BDs and gingival health parameters were analyzed by One-Way ANOVA or Kruskal Wallis tests, whereas poisson multilevel regression was used to the factors that influenced histatin degradation (α = 5%). Results Groups G1 and G3 differed significantly on OHI–S, visible biofilm, oral calculus and GI (p < 0.001). Poisson Regression showed that: 1) CP and gingivitis influenced the degradation of histatin 1 and 5 (p < 0.05); 2) The degradation of histatin 5 was influenced by age and male sex (p < 0.05); and 3) GI influenced significantly the degradation of histatin 1 (p < 0.001). Unique histatin degradation peptides were identified in individuals with gingivitis. Conslusions These data demonstrated that both the kinetics and pattern of histatins degradation differ according to the gingival health or disease conditions.
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Affiliation(s)
- Gabriela M de Gutierrez
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada.,University of Cruzeiro do Sul, Rua Galvão Bueno, 868 - Liberdade, São Paulo, SP, 01506-000, Brazil
| | - Lina M Marin
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada
| | - Yizhi Xiao
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada
| | - Andrea Escalante-Herrera
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada
| | - Maria T B R Santos
- University of Cruzeiro do Sul, Rua Galvão Bueno, 868 - Liberdade, São Paulo, SP, 01506-000, Brazil
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada
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14
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Sheikh-Mohamed S, Isho B, Chao GY, Zuo M, Cohen C, Lustig Y, Nahass GR, Salomon-Shulman RE, Blacker G, Fazel-Zarandi M, Rathod B, Colwill K, Jamal A, Li Z, de Launay KQ, Takaoka A, Garnham-Takaoka J, Patel A, Fahim C, Paterson A, Li AX, Haq N, Barati S, Gilbert L, Green K, Mozafarihashjin M, Samaan P, Budylowski P, Siqueira WL, Mubareka S, Ostrowski M, Rini JM, Rojas OL, Weissman IL, Tal MC, McGeer A, Regev-Yochay G, Straus S, Gingras AC, Gommerman JL. Systemic and mucosal IgA responses are variably induced in response to SARS-CoV-2 mRNA vaccination and are associated with protection against subsequent infection. Mucosal Immunol 2022; 15:799-808. [PMID: 35468942 PMCID: PMC9037584 DOI: 10.1038/s41385-022-00511-0] [Citation(s) in RCA: 119] [Impact Index Per Article: 59.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 03/02/2022] [Accepted: 03/23/2022] [Indexed: 02/04/2023]
Abstract
Although SARS-CoV-2 infects the upper respiratory tract, we know little about the amount, type, and kinetics of antibodies (Ab) generated in the oral cavity in response to COVID-19 vaccination. We collected serum and saliva samples from participants receiving two doses of mRNA COVID-19 vaccines and measured the level of anti-SARS-CoV-2 Ab. We detected anti-Spike and anti-Receptor Binding Domain (RBD) IgG and IgA, as well as anti-Spike/RBD associated secretory component in the saliva of most participants after dose 1. Administration of a second dose of mRNA boosted the IgG but not the IgA response, with only 30% of participants remaining positive for IgA at this timepoint. At 6 months post-dose 2, these participants exhibited diminished anti-Spike/RBD IgG levels, although secretory component-associated anti-Spike Ab were more stable. Examining two prospective cohorts we found that participants who experienced breakthrough infections with SARS-CoV-2 variants had lower levels of vaccine-induced serum anti-Spike/RBD IgA at 2-4 weeks post-dose 2 compared to participants who did not experience an infection, whereas IgG levels were comparable between groups. These data suggest that COVID-19 vaccines that elicit a durable IgA response may have utility in preventing infection. Our study finds that a local secretory component-associated IgA response is induced by COVID-19 mRNA vaccination that persists in some, but not all participants. The serum and saliva IgA response modestly correlate at 2-4 weeks post-dose 2. Of note, levels of anti-Spike serum IgA (but not IgG) at this timepoint are lower in participants who subsequently become infected with SARS-CoV-2. As new surges of SARS-CoV-2 variants arise, developing COVID-19 booster shots that provoke high levels of IgA has the potential to reduce person-to-person transmission.
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Affiliation(s)
| | - Baweleta Isho
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Gary Y.C. Chao
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Michelle Zuo
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Carmit Cohen
- Sheba Medical Center Tel Hashomer, Ramat Gan, Sackler School of Medicine, Tel Aviv University, Tel Aviv-Yafo, Israel
| | - Yaniv Lustig
- Sheba Medical Center Tel Hashomer, Ramat Gan, Sackler School of Medicine, Tel Aviv University, Tel Aviv-Yafo, Israel,Central Virology Laboratory, Public Health Services, Ministry of Health, Sheba Medical Center, Tel-Hashomer, Tel-Aviv University, Tel Aviv-Yafo, Israel,Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv-Yafo, Israel
| | - George R. Nahass
- Institute for Stem Cell Biology and Regenerative Medicine and the Ludwig Cancer Center, Stanford University School of Medicine, Stanford, CA, USA,University of Illinois-Chicago, College of Medicine, Chicago, USA
| | - Rachel E. Salomon-Shulman
- Institute for Stem Cell Biology and Regenerative Medicine and the Ludwig Cancer Center, Stanford University School of Medicine, Stanford, CA, USA
| | - Grace Blacker
- Institute for Stem Cell Biology and Regenerative Medicine and the Ludwig Cancer Center, Stanford University School of Medicine, Stanford, CA, USA
| | | | - Bhavisha Rathod
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Karen Colwill
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Alainna Jamal
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Zhijie Li
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Keelia Quinn de Launay
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada,Li Ka Shing Knowledge Institute of St. Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada
| | - Alyson Takaoka
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada,Li Ka Shing Knowledge Institute of St. Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada
| | - Julia Garnham-Takaoka
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada,Li Ka Shing Knowledge Institute of St. Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada
| | - Anjali Patel
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada,Li Ka Shing Knowledge Institute of St. Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada
| | - Christine Fahim
- Li Ka Shing Knowledge Institute of St. Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada
| | - Aimee Paterson
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Angel Xinliu Li
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Nazrana Haq
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Shiva Barati
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Lois Gilbert
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Karen Green
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | | | - Philip Samaan
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Patrick Budylowski
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | | | - Samira Mubareka
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada,Sunnybrook Health Sciences Centre, Toronto, ON, Canada
| | - Mario Ostrowski
- Department of Immunology, University of Toronto, Toronto, ON, Canada,Department of Medicine, University of Toronto, Toronto, ON, Canada,Keenan Research Centre for Biomedical Science, Toronto, ON, Canada
| | - James M. Rini
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada,Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Olga L. Rojas
- Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Irving L. Weissman
- Institute for Stem Cell Biology and Regenerative Medicine and the Ludwig Cancer Center, Stanford University School of Medicine, Stanford, CA, USA
| | - Michal Caspi Tal
- Institute for Stem Cell Biology and Regenerative Medicine and the Ludwig Cancer Center, Stanford University School of Medicine, Stanford, CA, USA
| | - Allison McGeer
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada
| | - Gili Regev-Yochay
- Sheba Medical Center Tel Hashomer, Ramat Gan, Sackler School of Medicine, Tel Aviv University, Tel Aviv-Yafo, Israel
| | - Sharon Straus
- Li Ka Shing Knowledge Institute of St. Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada
| | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Sinai Health, Toronto, ON, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
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15
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Moussa DG, Ahmad P, Mansour TA, Siqueira WL. Current State and Challenges of the Global Outcomes of Dental Caries Research in the Meta-Omics Era. Front Cell Infect Microbiol 2022; 12:887907. [PMID: 35782115 PMCID: PMC9247192 DOI: 10.3389/fcimb.2022.887907] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 05/04/2022] [Indexed: 12/20/2022] Open
Abstract
Despite significant healthcare advances in the 21st century, the exact etiology of dental caries remains unsolved. The past two decades have witnessed a tremendous growth in our understanding of dental caries amid the advent of revolutionary omics technologies. Accordingly, a consensus has been reached that dental caries is a community-scale metabolic disorder, and its etiology is beyond a single causative organism. This conclusion was based on a variety of microbiome studies following the flow of information along the central dogma of biology from genomic data to the end products of metabolism. These studies were facilitated by the unprecedented growth of the next- generation sequencing tools and omics techniques, such as metagenomics and metatranscriptomics, to estimate the community composition of oral microbiome and its functional potential. Furthermore, the rapidly evolving proteomics and metabolomics platforms, including nuclear magnetic resonance spectroscopy and/or mass spectrometry coupled with chromatography, have enabled precise quantification of the translational outcomes. Although the majority supports ‘conserved functional changes’ as indicators of dysbiosis, it remains unclear how caries dynamics impact the microbiota functions and vice versa, over the course of disease onset and progression. What compounds the situation is the host-microbiota crosstalk. Genome-wide association studies have been undertaken to elucidate the interaction of host genetic variation with the microbiome. However, these studies are challenged by the complex interaction of host genetics and environmental factors. All these complementary approaches need to be orchestrated to capture the key players in this multifactorial disease. Herein, we critically review the milestones in caries research focusing on the state-of-art singular and integrative omics studies, supplemented with a bibliographic network analysis to address the oral microbiome, the host factors, and their interactions. Additionally, we highlight gaps in the dental literature and shed light on critical future research questions and study designs that could unravel the complexities of dental caries, the most globally widespread disease.
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Affiliation(s)
- Dina G. Moussa
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Paras Ahmad
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Tamer A. Mansour
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA, United States
- Department of Clinical Pathology, School of Medicine, Mansoura University, Mansoura, Egypt
| | - Walter L. Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
- *Correspondence: Walter L. Siqueira,
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16
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Rodrigues RPCB, Vidigal MTC, Vieira WA, Nascimento GG, Sabino-Silva R, Blumenberg C, Siqueira MF, Siqueira WL, Paranhos LR. Salivary changes in chronic kidney disease and in patients undergoing hemodialysis: a systematic review and meta-analysis. J Nephrol 2022; 35:1339-1367. [PMID: 35235185 DOI: 10.1007/s40620-022-01274-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 02/06/2022] [Indexed: 12/12/2022]
Abstract
OBJECTIVES This study is aimed at describing changes in salivary flow rate and ionic composition present in the saliva of chronic kidney disease (CKD) patients by assessing the pH, calcium, phosphate, and phosphorus concentrations and comparing them to healthy individuals, along with exploring the influence of hemodialysis on these parameters. METHODS The bibliographical search was performed in nine databases to find all types of studies, including observational clinical studies, without restrictions regarding publication year or language. Two reviewers selected the studies, extracted the data, and assessed the risk of bias using JBI tools. Random-effect meta-analysis was performed with the standardized mean difference (SMD) as effect estimate, at a 95% confidence interval. RESULTS Thirty-three studies were included in the qualitative synthesis and 31 studies were included in the meta-analysis. Chronic kidney disease patients presented lower salivary flow rate (SMD: - 1.73; 95% CI = - 2.14; - 1.31), higher pH (SMD: 1.57; 95% CI = 1.11; 2.03), and higher phosphorus concentration (SMD: 0.86; 95% CI = 0.63; 1.09) in saliva. Concurrently, salivary flow rate and pH presented significant changes after hemodialysis, with higher salivary flow rate (SMD: 0.53; 95% CI = 0.25; 0.81) and lower pH (SMD: - 0.53; 95% CI = - 0.88; - 0.19) in patients on hemodialysis treatment. CONCLUSION Chronic kidney disease patients present reduced salivary flow rate and increased pH and phosphorus concentration in saliva. Hemodialysis can increase the salivary flow rate of these patients.
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Affiliation(s)
- Renata Prata Cunha Bernardes Rodrigues
- Division of Preventive and Community Dentistry, School of Dentistry, Federal University of Uberlândia, Campus Umuarama, Av. Pará, 1720, Bloco 2G, sala 1, Uberlândia, Minas Gerais, 38405-320, Brazil
| | | | - Walbert A Vieira
- Endodontics Division, Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas, UNICAMP, Piracicaba, Brazil
| | - Gustavo G Nascimento
- Section for Periodontology, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Robinson Sabino-Silva
- Innovation Center in Salivary Diagnostics and Nanotheranostics, Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlândia, Uberlândia, Brazil
| | - Cauane Blumenberg
- Department of Social Medicine, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | | | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Luiz Renato Paranhos
- Division of Preventive and Community Dentistry, School of Dentistry, Federal University of Uberlândia, Campus Umuarama, Av. Pará, 1720, Bloco 2G, sala 1, Uberlândia, Minas Gerais, 38405-320, Brazil.
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Marin LM, Cury JA, Siqueira WL. Validation of a cariogenic biofilm model by evaluating the effect of fluoride on enamel demineralization. J Microbiol Methods 2021; 192:106386. [PMID: 34848194 DOI: 10.1016/j.mimet.2021.106386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/24/2021] [Accepted: 11/25/2021] [Indexed: 02/05/2023]
Abstract
In vitro biofilm models have been extensively used, but only few of the models available to date had been validated in terms of the dose-response effect of anti-caries and/or antimicrobial substances. Additionally, none of the validated models allow the use of microliter volumes of the treatment solutions, needed mainly to test (screen) novel but expensive substances under development. This study aimed at modifying an in vitro cariogenic Streptococcus mutans biofilm model and validating it by assessing the dose-response effect of fluoride on enamel demineralization. S. mutans cariogenic biofilms were developed on saliva-coated enamel slabs previously bonded to acrylic holders fixed to a lid of a culture plate. Biofilms were incubated 8 h/day in culture medium supplemented with 1% sucrose and then overnight in culture medium with glucose 0.1 mM. Biofilms were also treated 2×/day with 2.0 mL of solutions containing 0, 125, 275 and 1250 μg F/mL (n = 10/group). The replaced culture medium was used to: determine the biofilm acidogenicity; estimate the demineralization of enamel; and monitor the fluoride concentration. At 144 h, biofilms were collected for fluoride concentration analyses, and the fluoride uptake by enamel was determined in each slab. The model showed a dose-response effect of fluoride (R2 = 0.96, p < 0.001) between enamel demineralization and the fluoride concentration of the treatments. Water-soluble and bound biofilm fluoride concentrations (p < 0.007), as well as the firmly-bound fluoride concentration found in enamel (p < 0.0001), increased in a dose-dependent manner. Our model constitutes a validated approach that would allow the assessment of the anticaries potential of novel biotechnological strategies, as in the case of expensive salivary peptides, because it would allow to test the treatment solutions using smaller volumes.
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Affiliation(s)
- Lina M Marin
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada
| | - Jaime A Cury
- Piracicaba Dental School, University of Campinas, Av. Limeira 901, Piracicaba, SP, 13414-903, Brazil
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada.
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18
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Madathil S, Siqueira WL, Marin LM, Sanaulla FB, Faraj N, Quiñonez CR, McNally M, Glogauer M, Allison P. The incidence of COVID-19 among dentists practicing in the community in Canada: A prospective cohort study over a six-month period. J Am Dent Assoc 2021; 153:450-459.e1. [PMID: 35241268 PMCID: PMC8565357 DOI: 10.1016/j.adaj.2021.10.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 10/05/2021] [Accepted: 10/06/2021] [Indexed: 11/28/2022]
Abstract
Background Oral health care settings carry a potentially high risk of causing cross-infection between dentists and patients and among dental staff members due to close contact and use of aerosol-generating procedures. The authors aimed to estimate COVID-19 incidence rates among Canadian dentists over a 6-month period. Methods The authors conducted a prospective cohort study of 644 licensed dentists across Canada from July 29, 2020, through February 12, 2021. An online questionnaire, adapted from the World Health Organization’s Unity Studies protocols for assessment of COVID-19 risk among health care workers, was used to collect data on self-reported severe acute respiratory syndrome coronavirus 2 infections every 4 weeks. A bayesian Poisson model was used to estimate the incidence rate and corresponding 95% credible intervals (CIs). Results Median age of participants was 47 years; most participants were women (56.4%) and general practitioners (90.8%). Median follow-up time was 188 days. Six participants reported COVID-19 infections during the study period, giving an incidence rate of 5.10 per 100,000 person-days (95% CI, 1.86 to 9.91 per 100,000 person-days). The incidence proportion was estimated to be 1,084 per 100,000 dentists (95% CI, 438 to 2,011 per 100,000 dentists) and 1,864 per 100,000 people (95% CI, 1,859 to 1,868 per 100,000 people) in the Canadian population during the same period. Conclusions The low infection rate observed among Canadian dentists from July 29, 2020, through February 12, 2021, should be reassuring to the dental and general community. Practical Implications Although the infection rates were low among Canadian dentists, it is important to continue to collect disease surveillance data.
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Moussa DG, Siqueira WL. Bioinspired caries preventive strategy via customizable pellicles of saliva-derived protein/peptide constructs. Sci Rep 2021; 11:17007. [PMID: 34417532 PMCID: PMC8379205 DOI: 10.1038/s41598-021-96622-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 08/02/2021] [Indexed: 01/18/2023] Open
Abstract
Dental caries has been the most widespread chronic disease globally associated with significant health and financial burdens. Caries typically starts in the enamel, which is a unique tissue that cannot be healed or regrown; nonetheless, new preventive approaches have limitations and no effective care has developed yet. Since enamel is a non-renewable tissue, we believe that the intimate overlaying layer, the acquired enamel pellicle (AEP), plays a crucial lifetime protective role and could be employed to control bacterial adhesion and dental plaque succession. Based on our identified AEP whole proteome/peptidome, we investigated the bioinhibitory capacities of the native abundant proteins/peptides adsorbed in pellicle-mimicking conditions. Further, we designed novel hybrid constructs comprising antifouling and antimicrobial functional domains derived from statherin and histatin families, respectively, to attain synergistic preventive effects. Three novel constructs demonstrated significant multifaceted bio-inhibition compared to either the whole saliva and/or its native proteins/peptides via reducing biomass fouling and inducing biofilm dispersion beside triggering bacterial cell death. These data are valuable to bioengineer precision-guided enamel pellicles as an efficient and versatile prevention remedy. In conclusion, integrating complementary acting functional domains of salivary proteins/peptides is a novel translational approach to design multifunctional customizable enamel pellicles for caries prevention.
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Affiliation(s)
- Dina G Moussa
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada.
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20
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Saeed SG, Bain JL, Khoo E, Siqueira WL, van der Hoeven R. Should attendance for preclinical simulation and clinical education be mandatory? J Dent Educ 2021; 85:1655-1663. [PMID: 34169519 DOI: 10.1002/jdd.12701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 05/30/2021] [Indexed: 11/07/2022]
Abstract
Mandatory attendance, particularly in didactic settings, is a highly debated topic in higher education, including dental education. Within dental education, a large portion of education occurs in preclinical laboratories and clinical environments. There is little to no research on attendance in these settings in dental schools. This point/counterpoint paper examines the pros and cons of mandatory attendance in these highly specialized educational settings. With the backdrop of the COVID-19 pandemic that began in March 2020 and continues to impact dental education at the time of publication, this topic has become even more relevant. Viewpoint 1 claims that attendance should be mandatory because a greater exposure to preclinical and clinical environments helps foster better clinical hand skills, critical thinking, decision-making, problem-solving skills, and an overall sense of professional identity. It goes on further to suggest that there may be a link between attendance and performance in exams and that attendance is part of the dental school's responsibility. Viewpoint 2 argues that the rationale for attendance is complex, and that creating learning environments that are psychologically safe will incentivize students to attend, even without mandatory attendance policies. Furthermore, it explains that technological advances have allowed dental schools to think creatively about asynchronous learning, which by its very nature does not require attendance at a given time. The authors of both viewpoints conclude that the preclinical and clinical education and experience are critical dental education and that dental school leaders should focus on improving the quality of these experiences.
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Affiliation(s)
- Sophia G Saeed
- Department of General Practice and Dental Public Health, UTHealth School of Dentistry at Houston, Houston, Texas, USA
| | - Jennifer L Bain
- Department of Periodontics and Preventive Sciences, School of Dentistry, The University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Edmund Khoo
- Department of Orthodontics, College of Dentistry, New York University, New York City, New York, USA
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Ransome van der Hoeven
- Department of Diagnostic and Biomedical Sciences, UTHealth School of Dentistry at Houston, Houston, Texas, USA
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21
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Zhu Y, Marin LM, Xiao Y, Gillies ER, Siqueira WL. pH-Sensitive Chitosan Nanoparticles for Salivary Protein Delivery. Nanomaterials (Basel) 2021; 11:nano11041028. [PMID: 33920657 PMCID: PMC8073935 DOI: 10.3390/nano11041028] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/09/2021] [Accepted: 04/14/2021] [Indexed: 12/01/2022]
Abstract
Salivary proteins such as histatins (HTNs) have demonstrated critical biological functions directly related to tooth homeostasis and prevention of dental caries. However, HTNs are susceptible to the high proteolytic activities in the oral environment. Therefore, pH-sensitive chitosan nanoparticles (CNs) have been proposed as potential carriers to protect proteins from enzymatic degradation at physiological salivary pH. Four different types of chitosan polymers were investigated and the optimal formulation had good batch to batch reproducibility, with an average hydrodynamic diameter of 144 ± 6 nm, a polydispersity index of 0.15 ± 0.04, and a zeta potential of 18 ± 4 mV at a final pH of 6.3. HTN3 encapsulation and release profiles were characterized by cationic polyacrylamide gel electrophoresis. The CNs successfully encapsulated HTN3 and selectively swelled at acidic pH to facilitate HTN3 release. Protection of HTN3 against enzymatic degradation was investigated in diluted whole saliva. HTN3 encapsulated in the CNs had a prolonged survival time compared to the free HTN3. CNs with and without HTN3 also successfully reduced biofilm weight and bacterial viability. The results of this study have demonstrated the suitability of CNs as potential protein carriers for oral applications, especially for complications occurring at acidic conditions.
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Affiliation(s)
- Yi Zhu
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada; (Y.Z.); (E.R.G.)
| | - Lina M. Marin
- College of Dentistry, University of Saskatchewan, 105 Wiggins Rd, Saskatoon, SK S7N 5E4, Canada;
| | - Yizhi Xiao
- Schulich Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5C1, Canada;
| | - Elizabeth R. Gillies
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada; (Y.Z.); (E.R.G.)
- Department of Chemistry, Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - Walter L. Siqueira
- College of Dentistry, University of Saskatchewan, 105 Wiggins Rd, Saskatoon, SK S7N 5E4, Canada;
- Correspondence:
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22
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Rosa V, Ho D, Sabino-Silva R, Siqueira WL, Silikas N. Fighting viruses with materials science: Prospects for antivirus surfaces, drug delivery systems and artificial intelligence. Dent Mater 2021; 37:496-507. [PMID: 33441249 PMCID: PMC7834288 DOI: 10.1016/j.dental.2020.12.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 11/30/2020] [Accepted: 12/14/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Viruses on environmental surfaces, in saliva and other body fluids represent risk of contamination for general population and healthcare professionals. The development of vaccines and medicines is costly and time consuming. Thus, the development of novel materials and technologies to decrease viral availability, viability, infectivity, and to improve therapeutic outcomes can positively impact the prevention and treatment of viral diseases. METHODS Herein, we discuss (a) interaction mechanisms between viruses and materials, (b) novel strategies to develop materials with antiviral properties and oral antiviral delivery systems, and (c) the potential of artificial intelligence to design and optimize preventive measures and therapeutic regimen. RESULTS The mechanisms of viral adsorption on surfaces are well characterized but no major breakthrough has become clinically available. Materials with fine-tuned physical and chemical properties have the potential to compromise viral availability and stability. Emerging strategies using oral antiviral delivery systems and artificial intelligence can decrease infectivity and improve antiviral therapies. SIGNIFICANCE Emerging viral infections are concerning due to risk of mortality, as well as psychological and economic impacts. Materials science emerges for the development of novel materials and technologies to diminish viral availability, infectivity, and to enable enhanced preventive and therapeutic strategies, for the safety and well-being of humankind.
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Affiliation(s)
- Vinicius Rosa
- Faculty of Dentistry, National University of Singapore, Singapore; Craniofacial Research and Innovation Center, National University of Singapore, Singapore.
| | - Dean Ho
- The N.1 Institute for Health (N.1), Institute for Digital Medicine (WisDM), Department of Biomedical Engineering, and Department of Pharmacology, National University of Singapore, Singapore.
| | - Robinson Sabino-Silva
- Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlandia, Brazil.
| | | | - Nikolaos Silikas
- Division of Dentistry, School of Medical Sciences, University of Manchester, United Kingdom.
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23
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Siqueira MF, Brothwell D, Heinrichs A, Siqueira WL. Rapid redesign and implementation of new preclinic and clinic scheduled model during COVID-19. J Dent Educ 2021; 85 Suppl 3:1980-1981. [PMID: 33635555 PMCID: PMC8014326 DOI: 10.1002/jdd.12583] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 02/02/2021] [Accepted: 02/19/2021] [Indexed: 11/11/2022]
Affiliation(s)
- Michelle F Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Douglas Brothwell
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Alan Heinrichs
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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24
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Siqueira MF, Saeed SG, Siqueira WL. Using Facebook to increase student engagement. J Dent Educ 2021; 85 Suppl 3:2028-2029. [PMID: 33448371 DOI: 10.1002/jdd.12531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/19/2020] [Accepted: 12/24/2020] [Indexed: 11/08/2022]
Affiliation(s)
- Michelle F Siqueira
- University of Saskatchewan College of Dentistry, Saskatoon, Saskatchewan, Canada
| | - Sophia G Saeed
- School of Dentistry, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Walter L Siqueira
- University of Saskatchewan College of Dentistry, Saskatoon, Saskatchewan, Canada
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25
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Gitalis R, Bae JH, Preston M, Patel M, Liu Z, Sun C, Stewart C, Xiao Y, Siqueira WL, Glogauer M, Finer Y. Human neutrophils compromise the restoration-tooth interface. Acta Biomater 2020; 117:283-293. [PMID: 32950724 DOI: 10.1016/j.actbio.2020.09.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 09/04/2020] [Accepted: 09/04/2020] [Indexed: 01/10/2023]
Abstract
Neutrophils, cells of the innate immune system, enter the mouth and release factors that are hypothesized to contribute to the degradation of tooth dentin, methacrylate resin composites, and adhesives at the restoration-tooth-dentin interface. The objectives were to characterize neutrophils' degradation towards resin composite, self-etch (SE) and total-etch (TE) adhesives, SE and TE resin-dentin interfaces and to identify proteins that could contribute to the degradation process. Neutrophils' degradation of cured resin composite, and SE and TE adhesives, was quantified by measuring the specific resin degradation by-product, bishydroxy-propoxy-phenyl-propane (bisHPPP), released after 30 days incubation of the materials with the cells. Neutrophils' degradative effect on resin-dentin interfaces was examined by recording the interfacial fracture toughness (FT), and surface analysis of the fracture mode following incubation of SE and TE miniature short-rod (mini-SR) specimens with the cells. Neutrophils increased degradation of polymerized resin composite, and TE adhesive, but not SE adhesive over 30 days (p < 0.05). Incubation of SE and TE resin-dentin interfaces with neutrophils led to a reduction in FT over time (p < 0.05). The effect was more pronounced for TE interfaces. Neutrophils also affected the fracture mode of SE and TE resin-dentin interfaces. Several proteins that could contribute to the degradative activity of neutrophils, including Neutrophil collagenase (MMP-8), Matrix metalloproteinase- 9 (MMP-9), Cathepsin G, Neutrophil- gelatinase associated lipocalin (NGAL) and Myeloperoxidase, were isolated. The ability of neutrophils to degrade resin, tooth dentin, and reduce the bond strength of resin-dentin interfaces suggest neutrophils' potential role in primary and recurrent caries and dental restoration failure.
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26
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Isho B, Abe KT, Zuo M, Jamal AJ, Rathod B, Wang JH, Li Z, Chao G, Rojas OL, Bang YM, Pu A, Christie-Holmes N, Gervais C, Ceccarelli D, Samavarchi-Tehrani P, Guvenc F, Budylowski P, Li A, Paterson A, Yue FY, Marin LM, Caldwell L, Wrana JL, Colwill K, Sicheri F, Mubareka S, Gray-Owen SD, Drews SJ, Siqueira WL, Barrios-Rodiles M, Ostrowski M, Rini JM, Durocher Y, McGeer AJ, Gommerman JL, Gingras AC. Persistence of serum and saliva antibody responses to SARS-CoV-2 spike antigens in COVID-19 patients. Sci Immunol 2020. [PMID: 33033173 DOI: 10.1101/2020.08.01.20166553] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
While the antibody response to SARS-CoV-2 has been extensively studied in blood, relatively little is known about the antibody response in saliva and its relationship to systemic antibody levels. Here, we profiled by enzyme-linked immunosorbent assays (ELISAs) IgG, IgA and IgM responses to the SARS-CoV-2 spike protein (full length trimer) and its receptor-binding domain (RBD) in serum and saliva of acute and convalescent patients with laboratory-diagnosed COVID-19 ranging from 3-115 days post-symptom onset (PSO), compared to negative controls. Anti-SARS-CoV-2 antibody responses were readily detected in serum and saliva, with peak IgG levels attained by 16-30 days PSO. Longitudinal analysis revealed that anti-SARS-CoV-2 IgA and IgM antibodies rapidly decayed, while IgG antibodies remained relatively stable up to 105 days PSO in both biofluids. Lastly, IgG, IgM and to a lesser extent IgA responses to spike and RBD in the serum positively correlated with matched saliva samples. This study confirms that serum and saliva IgG antibodies to SARS-CoV-2 are maintained in the majority of COVID-19 patients for at least 3 months PSO. IgG responses in saliva may serve as a surrogate measure of systemic immunity to SARS-CoV-2 based on their correlation with serum IgG responses.
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Affiliation(s)
- Baweleta Isho
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Kento T Abe
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Michelle Zuo
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Alainna J Jamal
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada.,Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Bhavisha Rathod
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Jenny H Wang
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Zhijie Li
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Gary Chao
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Olga L Rojas
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Yeo Myong Bang
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Annie Pu
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | | | - Christian Gervais
- Mammalian Cell Expression, Human Health Therapeutics Research Centre, National Research Council Canada, Montréal, QC, Canada
| | - Derek Ceccarelli
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Payman Samavarchi-Tehrani
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Furkan Guvenc
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Patrick Budylowski
- Combined Containment Level 3 Unit, University of Toronto, Toronto, ON, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Angel Li
- Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Aimee Paterson
- Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Feng Yun Yue
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Lina M Marin
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Lauren Caldwell
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Jeffrey L Wrana
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Karen Colwill
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Frank Sicheri
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Samira Mubareka
- Department of Laboratory Medicine and Molecular Diagnostics, Division of Microbiology, Sunnybrook Health Sciences Centre; Biological Sciences, Sunnybrook Research Institute; and Division of Infectious Diseases, Sunnybrook Health Sciences Centre, Toronto, ON, Canada; Department of Laboratory Medicine and Pathology, University of Toronto, Toronto, ON, Canada
| | - Scott D Gray-Owen
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.,Combined Containment Level 3 Unit, University of Toronto, Toronto, ON, Canada
| | - Steven J Drews
- Canadian Blood Services, Edmonton, AB & Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Miriam Barrios-Rodiles
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Mario Ostrowski
- Department of Immunology, University of Toronto, Toronto, ON, Canada.,St. Michael's Hospital, Toronto, ON, Canada; Li Ka Shing Knowledge Institute.,Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - James M Rini
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Yves Durocher
- Mammalian Cell Expression, Human Health Therapeutics Research Centre, National Research Council Canada, Montréal, QC, Canada
| | - Allison J McGeer
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada.,Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada.,Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | | | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada. .,Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
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27
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Isho B, Abe KT, Zuo M, Jamal AJ, Rathod B, Wang JH, Li Z, Chao G, Rojas OL, Bang YM, Pu A, Christie-Holmes N, Gervais C, Ceccarelli D, Samavarchi-Tehrani P, Guvenc F, Budylowski P, Li A, Paterson A, Yue FY, Marin LM, Caldwell L, Wrana JL, Colwill K, Sicheri F, Mubareka S, Gray-Owen SD, Drews SJ, Siqueira WL, Barrios-Rodiles M, Ostrowski M, Rini JM, Durocher Y, McGeer AJ, Gommerman JL, Gingras AC. Persistence of serum and saliva antibody responses to SARS-CoV-2 spike antigens in COVID-19 patients. Sci Immunol 2020; 5:5/52/eabe5511. [PMID: 33033173 PMCID: PMC8050884 DOI: 10.1126/sciimmunol.abe5511] [Citation(s) in RCA: 534] [Impact Index Per Article: 133.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 10/05/2020] [Indexed: 12/13/2022]
Abstract
While the antibody response to SARS-CoV-2 has been extensively studied in blood, relatively little is known about the antibody response in saliva and its relationship to systemic antibody levels. Here, we profiled by enzyme-linked immunosorbent assays (ELISAs) IgG, IgA and IgM responses to the SARS-CoV-2 spike protein (full length trimer) and its receptor-binding domain (RBD) in serum and saliva of acute and convalescent patients with laboratory-diagnosed COVID-19 ranging from 3-115 days post-symptom onset (PSO), compared to negative controls. Anti-SARS-CoV-2 antibody responses were readily detected in serum and saliva, with peak IgG levels attained by 16-30 days PSO. Longitudinal analysis revealed that anti-SARS-CoV-2 IgA and IgM antibodies rapidly decayed, while IgG antibodies remained relatively stable up to 105 days PSO in both biofluids. Lastly, IgG, IgM and to a lesser extent IgA responses to spike and RBD in the serum positively correlated with matched saliva samples. This study confirms that serum and saliva IgG antibodies to SARS-CoV-2 are maintained in the majority of COVID-19 patients for at least 3 months PSO. IgG responses in saliva may serve as a surrogate measure of systemic immunity to SARS-CoV-2 based on their correlation with serum IgG responses.
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Affiliation(s)
- Baweleta Isho
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Kento T Abe
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Michelle Zuo
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Alainna J Jamal
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada
- Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Bhavisha Rathod
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Jenny H Wang
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Zhijie Li
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Gary Chao
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Olga L Rojas
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Yeo Myong Bang
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Annie Pu
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | | | - Christian Gervais
- Mammalian Cell Expression, Human Health Therapeutics Research Centre, National Research Council Canada, Montréal, QC, Canada
| | - Derek Ceccarelli
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Payman Samavarchi-Tehrani
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Furkan Guvenc
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Patrick Budylowski
- Combined Containment Level 3 Unit, University of Toronto, Toronto, ON, Canada
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada
| | - Angel Li
- Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Aimee Paterson
- Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Feng Yun Yue
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Lina M Marin
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Lauren Caldwell
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Jeffrey L Wrana
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Karen Colwill
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Frank Sicheri
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Samira Mubareka
- Department of Laboratory Medicine and Molecular Diagnostics, Division of Microbiology, Sunnybrook Health Sciences Centre; Biological Sciences, Sunnybrook Research Institute; and Division of Infectious Diseases, Sunnybrook Health Sciences Centre, Toronto, ON, Canada; Department of Laboratory Medicine and Pathology, University of Toronto, Toronto, ON, Canada
| | - Scott D Gray-Owen
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
- Combined Containment Level 3 Unit, University of Toronto, Toronto, ON, Canada
| | - Steven J Drews
- Canadian Blood Services, Edmonton, AB & Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Miriam Barrios-Rodiles
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | - Mario Ostrowski
- Department of Immunology, University of Toronto, Toronto, ON, Canada
- St. Michael's Hospital, Toronto, ON, Canada; Li Ka Shing Knowledge Institute
- Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - James M Rini
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Yves Durocher
- Mammalian Cell Expression, Human Health Therapeutics Research Centre, National Research Council Canada, Montréal, QC, Canada
| | - Allison J McGeer
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada
- Department of Microbiology, at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada
| | | | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, ON, Canada.
- Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
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28
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Zuanazzi D, Xiao Y, Siqueira WL. Evaluating protein binding specificity of titanium surfaces through mass spectrometry-based proteomics. Clin Oral Investig 2020; 25:2281-2296. [PMID: 32870391 DOI: 10.1007/s00784-020-03548-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Accepted: 08/24/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVES To evaluate whether surface characteristics of different titanium modifications may influence the composition of the salivary pellicle on each surface by analyzing the salivary proteome through mass spectrometry-based proteomics. MATERIALS AND METHODS Titanium discs with three surfaces modifications (PT (machined titanium), SLA (sandblasted/large-grit/acid-etched), and SLActive (modified SLA)) were characterized (topography, chemistry, and energy) prior to being exposed to saliva for 2 h to form a protein pellicle. The resultant protein layer was retrieved and analyzed through mass spectrometry (nLC-ESI-MS/MS) to examine the surface specificity for protein binding, while the proteome profile of each surface was classified. RESULTS The proteome analysis showed that the salivary pellicle composition was more complex on rough surfaces (SLA and SLActive). Although variability in protein composition was observed between surfaces, most proteins were detected on more than one surface, indicating a limited surface specificity for protein binding. Additionally, the salivary pellicle formed on the SLActive presented a larger number of proteins associated with immune response, biological adhesion, and biomineralization. CONCLUSIONS Although topography, chemistry, and energy differed between the surfaces, they were not determinant to produce a salivary pellicle with high surface specificity. Also, we showed that several salivary proteins adsorbed on Ti surfaces are involved in biological functions important to the biointegration. CLINICAL RELEVANCE This study sheds light on the necessity for the development of bioactive surfaces that favors the formation of a specific protein layer that can enhance tissue response to assist the biointegration of dental implants.
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Affiliation(s)
- David Zuanazzi
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada.,Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada
| | - Yizhi Xiao
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada.
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29
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Saeed SG, Bain J, Khoo E, Siqueira WL. COVID-19: Finding silver linings for dental education. J Dent Educ 2020; 84:1060-1063. [PMID: 32488877 PMCID: PMC7300654 DOI: 10.1002/jdd.12234] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/12/2020] [Accepted: 05/15/2020] [Indexed: 11/10/2022]
Affiliation(s)
- Sophia G Saeed
- University of Texas School of Dentistry at Houston, Houston, Texas, USA
| | - Jennifer Bain
- The University of Mississippi Medical Center School of Dentistry, Jackson, Mississippi, USA
| | - Edmund Khoo
- Clinical Orthodontics, New York University College of Dentistry, New York, New York, USA
| | - Walter L Siqueira
- University of Saskatchewan College of Dentistry, Saskatoon, Saskatchewan, Canada
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30
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Caixeta DC, Aguiar EMG, Cardoso-Sousa L, Coelho LMD, Oliveira SW, Espindola FS, Raniero L, Crosara KTB, Baker MJ, Siqueira WL, Sabino-Silva R. Salivary molecular spectroscopy: A sustainable, rapid and non-invasive monitoring tool for diabetes mellitus during insulin treatment. PLoS One 2020; 15:e0223461. [PMID: 32182246 PMCID: PMC7077825 DOI: 10.1371/journal.pone.0223461] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 02/24/2020] [Indexed: 12/19/2022] Open
Abstract
Monitoring of blood glucose is an invasive, painful and costly practice in diabetes. Consequently, the search for a more cost-effective (reagent-free), non-invasive and specific diabetes monitoring method is of great interest. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy has been used in diagnosis of several diseases, however, applications in the monitoring of diabetic treatment are just beginning to emerge. Here, we used ATR-FTIR spectroscopy to evaluate saliva of non-diabetic (ND), diabetic (D) and insulin-treated diabetic (D+I) rats to identify potential salivary biomarkers related to glucose monitoring. The spectrum of saliva of ND, D and D+I rats displayed several unique vibrational modes and from these, two vibrational modes were pre-validated as potential diagnostic biomarkers by ROC curve analysis with significant correlation with glycemia. Compared to the ND and D+I rats, classification of D rats was achieved with a sensitivity of 100%, and an average specificity of 93.33% and 100% using bands 1452 cm-1 and 836 cm-1, respectively. Moreover, 1452 cm-1 and 836 cm-1 spectral bands proved to be robust spectral biomarkers and highly correlated with glycemia (R2 of 0.801 and 0.788, P < 0.01, respectively). Both PCA-LDA and HCA classifications achieved an accuracy of 95.2%. Spectral salivary biomarkers discovered using univariate and multivariate analysis may provide a novel robust alternative for diabetes monitoring using a non-invasive and green technology.
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Affiliation(s)
- Douglas C Caixeta
- Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil.,Institute of Genetics and Biochemistry, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Emília M G Aguiar
- Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Léia Cardoso-Sousa
- Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Líris M D Coelho
- Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Stephanie W Oliveira
- Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Foued S Espindola
- Institute of Genetics and Biochemistry, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Leandro Raniero
- Nanosensor Laboratory, IP&D, University of Vale do Paraíba, São José Dos Campos, SP, Brazil
| | - Karla T B Crosara
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Matthew J Baker
- WestCHEM, Department of Pure and Applied Chemistry, Technology & Innovation Centre, University of Strathclyde, Glasgow, United Kingdom
| | - Walter L Siqueira
- College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Robinson Sabino-Silva
- Department of Physiology, Institute of Biomedical Sciences, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil.,College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Rodrigues RPCB, Aguiar EMG, Cardoso-Sousa L, Caixeta DC, Guedes CCFV, Siqueira WL, Maia YCP, Cardoso SV, Sabino-Silva R. Differential Molecular Signature of Human Saliva Using ATR-FTIR Spectroscopy for Chronic Kidney Disease Diagnosis. Braz Dent J 2019; 30:437-445. [DOI: 10.1590/0103-6440201902228] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 06/07/2018] [Indexed: 12/20/2022] Open
Abstract
Abstract The symptoms of chronic kidney disease (CKD) are often not specific or absent in the early stages of this illness. Therefore, there is a demand for developing low cost, non-invasive and highly accurate platforms for CKD diagnostics. We hypothesized that the level of specifics salivary components changes when CKD is emplace, which could be clinically used to discriminate CKD patients from healthy subjects. The present study aimed to compare salivary components between CKD patients and matched control subjects by using attenuated total reflection-Fourier Transform Infrared (ATR-FTIR) spectroscopy. The predictive power of salivary components was evaluated by receiver operating characteristic (ROC) curves. Several components were identified, and 4 of them showed different expression (p<0.05) between CKD and control subjects. Thiocyanate (SCN-, 2052 cm-1) and phospholipids/carbohydrates (924 cm-1) vibrational modes using original and second-derivative spectra by ATR-FTIR could potentially be used as salivary biomarkers to differentiate CKD than control subjects. The combination of original and second-derivative spectra by ATR-FTIR of 924 cm-1 vibrational modes could reach 92.8% sensitivity and 85.7% specificity for CKD detection. Despite, the limitation of our investigation, the acquired data indicates that salivary vibrational modes by ATR-FTIR platform should be further explored as an auxiliary diagnostic tool for CKD.
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Quesnel K, Shi-Wen X, Hutchenreuther J, Xiao Y, Liu S, Peidl A, Naskar D, Siqueira WL, O'Gorman DB, Hinz B, Stratton RJ, Leask A. CCN1 expression by fibroblasts is required for bleomycin-induced skin fibrosis. Matrix Biol Plus 2019; 3:100009. [PMID: 33543008 PMCID: PMC7852207 DOI: 10.1016/j.mbplus.2019.100009] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 06/04/2019] [Accepted: 06/29/2019] [Indexed: 01/16/2023] Open
Abstract
The microenvironment contributes to the excessive connective tissue deposition that characterizes fibrosis. Members of the CCN family of matricellular proteins are secreted by fibroblasts into the fibrotic microenvironment; however, the role of endogenous CCN1 in skin fibrosis is unknown. Mice harboring a fibroblast-specific deletion for CCN1 were used to assess if CCN1 contributes to dermal homeostasis, wound healing, and skin fibrosis. Mice with a fibroblast-specific CCN1 deletion showed progressive skin thinning and reduced accumulation of type I collagen; however, the overall mechanical property of skin (Young's modulus) was not significantly reduced. Real time-polymerase chain reaction analysis revealed that CCN1-deficient skin displayed reduced expression of mRNAs encoding enzymes that promote collagen stability (including prolyl-4-hydroxylase and PLOD2), although expression of COL1A1 mRNA was unaltered. CCN1-deficent skin showed reduced hydroxyproline levels. Electron microscopy revealed that collagen fibers were disorganized in CCN1-deficient skin. CCN1-deficient mice were resistant to bleomycin-induced skin fibrosis, as visualized by reduced collagen accumulation and skin thickness suggesting that deposition/accumulation of collagen is impaired in the absence of CCN1. Conversely, CCN1-deficient mice showed unaltered wound closure kinetics, suggesting de novo collagen production in response to injury did not require CCN1. In response to either wounding or bleomycin, induction of α-smooth muscle actin-positive myofibroblasts was unaffected by loss of CCN1. CCN1 protein was overexpressed by dermal fibroblasts isolated from lesional (i.e., fibrotic) areas of patients with early onset diffuse scleroderma. Thus, CCN1 expression by fibroblasts, being essential for skin fibrosis, is a viable anti-fibrotic target. The role of endogenous CCN1 in skin biology is largely unknown Fibroblast-specific deletion CCN1 causes thinner skin and misaligned collagen CCN1-deficient mice were resistant to bleomycin-induced skin fibrosis Wound healing closure kinetics was unaffected by loss of CCN1 CCN1 may be as a target for anti-fibrotic therapy
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Affiliation(s)
- Katherine Quesnel
- Department of Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Xu Shi-Wen
- Centre for Rheumatology, University College London (Royal Free Campus), London, NW3 2PF, UK
| | - James Hutchenreuther
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Yizhi Xiao
- Department of Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Shangxi Liu
- Department of Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Alexander Peidl
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - Deboki Naskar
- Laboratory of Tissue Repair and Regeneration, Faculty of Dentistry, University of Toronto, Toronto, ON, M5G 1G6, Canada
| | - Walter L Siqueira
- Department of Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
| | - David B O'Gorman
- Roth McFarlane Hand and Upper Limb Centre, Lawson Research Institute, London, ON, N6A 4V2, Canada.,Departments of Biochemistry and Surgery, University of Western Ontario, London, N6A 5C1, ON, N6A 5C1, Canada
| | - Boris Hinz
- Laboratory of Tissue Repair and Regeneration, Faculty of Dentistry, University of Toronto, Toronto, ON, M5G 1G6, Canada
| | - Richard J Stratton
- Centre for Rheumatology, University College London (Royal Free Campus), London, NW3 2PF, UK
| | - Andrew Leask
- Department of Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
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Khiyani MF, Ahmadi M, Barbeau J, Feine JS, de Souza RF, Siqueira WL, Emami E. Salivary Biomarkers in Denture Stomatitis: A Systematic Review. JDR Clin Trans Res 2019; 4:312-322. [PMID: 30931724 DOI: 10.1177/2380084419830941] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVE Denture stomatitis (DS) is an oral biofilm-associated inflammation of the denture-bearing mucosa. The objective of this review was to identify and evaluate the quality of evidence on the association between the levels of salivary biomarkers and DS among adults with and without palatal DS. MATERIALS AND METHODS Following the PRISMA guidelines, Medline, PubMed, EMBASE, and the Cochrane Central Register for Controlled Trials were searched for eligible studies from the beginning of the archives until December 2018. Experimental and observational studies with adult participants were included that had a control group or subgroup analysis and provided data on salivary biomarkers and DS. Articles in languages other than English or French were excluded. The level of evidence and grades of recommendation were established with the 2011 scale of the Oxford Centre for Evidence-Based Medicine. Additionally, the assessment of methodological quality was conducted with the STROBE statement (Strengthening the Reporting of Observational Studies in Epidemiology) and graded according to the Olmos scale. RESULTS From 1,008 citations, 9 studies were included in the systematic review (8 observational, 1 clinical trial). Seven studies suggested a statistically significant difference in the levels of salivary cytokines (IL-6, CCL3, TGF-β, CXCL8, GM-CSF, and TNF-α) between participants with DS and controls (P < 0.05). In contrast, 2 studies concluded that the difference in the levels of several salivary cytokines (IL2, IL12, IFN-g, IL-4, IL-8, IL-10, IL-17, TNF-α, and ICAM-1) between the groups was not statistically significant. The level of evidence for the majority of studies was 3, while the grade of recommendation for all the studies was B, interpreted as "favorable." In terms of methodological quality, most studies met 50% to 80% of STROBE criteria and were graded B. CONCLUSION Palatal inflammation in DS is significantly associated with the levels of salivary cytokines. KNOWLEDGE TRANSFER STATEMENT The results of this study identified altered levels of specific salivary biomarkers associated with denture stomatitis, which may aid in the early diagnosis and treatment of this disease.
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Affiliation(s)
- M F Khiyani
- Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
| | - M Ahmadi
- Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
| | - J Barbeau
- Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada
| | - J S Feine
- Faculty of Dentistry, McGill University, Montréal, QC, Canada
| | - R F de Souza
- Faculty of Dentistry, McGill University, Montréal, QC, Canada
| | - W L Siqueira
- Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON, Canada
| | - E Emami
- Faculty of Dental Medicine, Université de Montréal, Montreal, QC, Canada.,Faculty of Dentistry, McGill University, Montréal, QC, Canada
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Abdallah MN, Abughanam G, Tran SD, Sheikh Z, Mezour MA, Basiri T, Xiao Y, Cerruti M, Siqueira WL, Tamimi F. Comparative adsorption profiles of basal lamina proteome and gingival cells onto dental and titanium surfaces. Acta Biomater 2018; 73:547-558. [PMID: 29660511 DOI: 10.1016/j.actbio.2018.04.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 03/06/2018] [Accepted: 04/09/2018] [Indexed: 01/24/2023]
Abstract
Titanium (Ti) dental implants are susceptible to bacterial infections and failure due to lack of proper epithelial seal. Epithelial cells establish a strong epithelial seal around natural teeth by the deposition of basal lamina (BL) proteins that adsorb on the tooth surface. This seal can even be re-established onto cementum or dentin following injury or periodontal therapy. However, it is unclear how tooth surfaces promote this cell attachment and protein adsorption. Understanding the interactions between BL proteins and epithelial cells with dentin and Ti will facilitate the development of implant surfaces that promote the formation of an epithelial seal and improve the success of periodontal therapy and wound healing on natural teeth. To study these interactions, we used a surface proteomic approach to decipher the adsorption profile of BL proteins onto Ti and dentin, and correlated these adsorption profiles with in vitro interactions of human gingival fibroblasts and epithelial cells. Results showed that dentin adsorbed higher amounts of key BL proteins, particularly laminin and nidogen-1, and promoted more favorable interactions with epithelial cells than Ti. Next, dentin specimens were deproteinized or partially demineralized to determine if its mineral or protein component was responsible for BL adsorption and cell attachment. Deproteinized (mineral-rich) and partially demineralized (protein-rich) dentin specimens revealed BL proteins (i.e. laminin and nidogen-1) and epithelial cells interact preferentially with dentinal proteins rather than dentin mineral. These findings suggest that, unlike Ti, dentin and, in particular, dentinal proteins have a selective affinity to BL proteins that enhance epithelial cell attachment. STATEMENT OF SIGNIFICANCE It is remains unclear why natural teeth, unlike titanium dental implants, promote the formation of an epithelial seal that protects them against the external environment. This study used a surface screening approach to analyze the adsorption of proteins produced by epithelial tissues onto tooth-dentin and titanium surfaces, and correlate it with the behaviour of cells. This study shows that tooth-dentin, in particular its proteins, has a higher selective affinity to certain adhesion proteins, and subsequently allows more favourable interactions with epithelial cells than titanium. This knowledge could help in developing new approaches for re-establishing and maintaining the epithelial seal around teeth, and could pave the way for developing implants with surfaces that allow the formation of a true epithelial seal.
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Huang B, Siqueira WL, Cvitkovitch DG, Finer Y. Esterase from a cariogenic bacterium hydrolyzes dental resins. Acta Biomater 2018; 71:330-338. [PMID: 29496621 PMCID: PMC5899954 DOI: 10.1016/j.actbio.2018.02.020] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 02/16/2018] [Accepted: 02/20/2018] [Indexed: 11/27/2022]
Abstract
OBJECTIVES To identify and characterize specific esterases from S. mutans with degradative activity toward methacrylate-based resin monomers. METHODS Out of several putative esterases, an esterase encoded in an Open Reading Frame as SMU_118c (The National Center for Biotechnology Information, NCBI), was found to have true hydrolase activities. SMU_118c was cloned, expressed, purified and further characterized for its respective hydrolytic activity towards ester-containing nitrophenyl substrates and the universal resin monomers bis-phenyl-glycidyl-dimethacrylate (bisGMA) and triethyleneglycol dimethacrylate (TEGDMA) at neutral (7.0) or cariogenic (5.5) pH. Mass spectrometry (MS) was used to verify the expression of SMU_118c protein in S. mutans UA159. RESULTS Similar to the whole cell activity of S. mutans, SMU_118c showed the highest affinity toward para-nitrophenyl acetate (pNPA) and para-nitrophenyl butyrate (pNPB) vs. ortho-nitrophenyl butyrate (oNPB) and butyrylthiocholine iodide (BTC) (p < 0.05). The esterase retained 60% of its activity after 21 days and hydrolyzed bisGMA at a higher rate than TEGDMA at both neutral and cariogenic pH (p < 0.001), similarly to the predominant human salivary esterase degradative activity. MS confirmed that SMU_118c is an intracellular protein in S. mutans UA159 and expressed under pathogenic (pH 5.5) growth conditions. SIGNIFICANCE The similarity in the activity profile to the whole S. mutans bacterial cell, the stability over time at cariogenic pH, the preference to hydrolyze bisGMA and confirmed expression profile suggest that SMU_118c could be a significant contributor to the whole bacterial degradative activity of S. mutans toward the degradation of resin composites, adhesives and the restoration-tooth interface, potentially accelerating restoration's failure. STATEMENT OF SIGNIFICANCE The current study builds upon our highly-cited previous study by Bourbia et al., (JDR, 2013) that reported on that the cariogenic bacterium, S. mutans has esterase-like activities that enable the bacterium to degrade dental composites and adhesives. The current submission is the first to report on the isolation and characterization of the specific esterase activity (SMU_118c) from S. mutans that is a significant contributor to the whole bacterial degradative activity toward the hydrolysis of dental resins. This activity compromises the restoration-tooth interface, increases interfacial bacterial microleakage (Kermanshahi et al., JDR 2010), potentially contributing to the pathogenesis of recurrent caries around resin composite restorations. This represent a significant contribution to the field of biomaterials and their clinical performance.
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Affiliation(s)
- Bo Huang
- Faculty of Dentistry, University of Toronto, Ontario, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada
| | - Walter L Siqueira
- School of Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, Western University, Canada
| | - Dennis G Cvitkovitch
- Faculty of Dentistry, University of Toronto, Ontario, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada
| | - Yoav Finer
- Faculty of Dentistry, University of Toronto, Ontario, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada.
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Zuanazzi D, Arts EJ, Jorge PK, Mulyar Y, Gibson R, Xiao Y, Bringel Dos Santos M, Machado MAAM, Siqueira WL. Postnatal Identification of Zika Virus Peptides from Saliva. J Dent Res 2017; 96:1078-1084. [PMID: 28825520 DOI: 10.1177/0022034517723325] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We explored the potential to diagnose Zika virus (ZIKV) infection by analyzing peptides in saliva during a convalescent phase of infection, long after resolution of acute disease. A 25-y-old woman clinically diagnosed with Zika fever in the first trimester was enrolled with her dizygotic twins for a 3-mo postnatal sample of saliva (9-mo after maternal infection). The female baby (A) had microcephaly while the male baby (B) was born healthy. Peptidomic analysis was completed by mass spectrometry (MS/MS), and ZIKV peptides were identified using the National Institutes of Health Zika Virus Resource database, then aligned and mapped to the ZIKV polyprotein to determine proteome coverage and phylogenetic studies. A total of 423 (mother), 607 (baby A), and 183 (baby B) unique ZIKV peptides were identified in saliva by MS/MS, providing a coverage of 67%, 84%, and 45%, respectively, of the entire ZIKV polyprotein (>3,400 amino acids). All peptides were aligned to other flaviviruses that are circulating in Brazil (dengue and yellow fever) to discard false-positive matches. Nine peptides identified were highly conserved to dengue virus. Alignment of a contiguous peptide sequence for mother/babies with the 74 ZIKV sequences suggested that the virus may have entered the oral cavity through the salivary glands, leading to an infection that persists into the postnatal period (vertical transmission). Furthermore, we identified 9 sequence variations that were unique to the baby with microcephaly (not found in the mother or the twin). This sequence information could provide a template for future neuropathogenic studies. A much larger sample size is required to determine whether sequence variation in the envelope protein significantly associates with microcephaly. Finally, from a public health perspective, it will be important to determine whether viral replication is still taking place after birth and whether the virus can be transmitted through salivary contact.
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Affiliation(s)
- D Zuanazzi
- 1 Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada
| | - E J Arts
- 2 Department of Microbiology and Immunology, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada
| | - P K Jorge
- 1 Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada.,3 Department of Pediatric Dentistry, Bauru Dental School, University of São Paulo Bauru, São Paulo, Brazil
| | - Y Mulyar
- 1 Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada
| | - R Gibson
- 2 Department of Microbiology and Immunology, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada
| | - Y Xiao
- 1 Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada
| | - M Bringel Dos Santos
- 3 Department of Pediatric Dentistry, Bauru Dental School, University of São Paulo Bauru, São Paulo, Brazil
| | | | - W L Siqueira
- 1 Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON, Canada
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Abstract
While the oral health of persons with dementia has been shown to be poor, no systematic reviews have been published that examined the topic in depth, including participants with dementia representing the full spectrum of disease severity, and evaluating a broad scope of oral health assessments. The aim of this study was to conduct a current literature review to fill this gap in knowledge. A systematic search of 5 databases (CINAHL, PubMed, EMBASE, Scopus, and ISI Web of Science) was conducted to identify all relevant studies published up to May 2016. There were no exclusions related to study type, severity of dementia, dentate status, or living arrangements. Results were reported descriptively and summarized. Meta-analyses were performed where possible and reported as mean difference (MD) or standardized mean difference (SMD), with a 95% confidence interval (CI). Twenty-eight studies were identified. Assessments were conducted of tooth status, active dental caries, hygiene (plaque/calculus) of natural and artificial teeth, periodontal diseases, denture status (retention, stability, denture-related mucosal lesions), and oral health-related quality of life. Across all evaluations, persons with dementia generally had scores/results suggestive of poor oral health. In meta-analyses, compared with persons without dementia, those with dementia had a significantly fewer number of teeth (MD, -1.52; 95% CI, -0.2.52 to -0.52; P = 0.003; n = 13 studies), more carious teeth (SMD, 0.29; 95% CI, 0.03 to 0.48; P = 0.028; n = 9), significantly worse oral hygiene evaluated using a broad range of assessment tools (SMD, 0.88; 95% CI, 0.57 to 1.19, P < 0.0001; n = 7), and significantly poorer periodontal health (SMD, 0.38; 95% CI, 0.06 to 0.70; P = 0.02; n = 6 studies). The oral health status of persons with mild to severe forms of dementia, who were living in both the community and residential care facilities, was found to be poor across a broad range of dental assessments. Knowledge Transfer Statement: The results of this study define the scope of oral issues and quantify the degree of impairment in individuals with dementia, evaluated using a variety of oral health measures. The results revealed that poor oral health is associated with dementia.
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Affiliation(s)
- N C Foley
- 1 Department of Physical Medicine & Rehabilitation, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada.,2 Department of Foods & Nutrition, Brescia University College, London, Ontario, Canada
| | - R H Affoo
- 3 Graduate Program of Health and Rehabilitation Sciences, The University of Western Ontario, London, Ontario, Canada
| | - W L Siqueira
- 4 Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada
| | - R E Martin
- 1 Department of Physical Medicine & Rehabilitation, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada.,3 Graduate Program of Health and Rehabilitation Sciences, The University of Western Ontario, London, Ontario, Canada.,4 Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada.,5 School of Communication Sciences & Disorders, Elborn College, The University of Western Ontario, London, Ontario, Canada.,6 Departments of Physiology & Pharmacology, The University of Western Ontario, London, Ontario, Canada.,7 Faculty of Health Sciences, The University of Western Ontario, London, Ontario, Canada
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Abdallah MN, Tran SD, Abughanam G, Laurenti M, Zuanazzi D, Mezour MA, Xiao Y, Cerruti M, Siqueira WL, Tamimi F. Biomaterial surface proteomic signature determines interaction with epithelial cells. Acta Biomater 2017; 54:150-163. [PMID: 28259836 DOI: 10.1016/j.actbio.2017.02.044] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 02/21/2017] [Accepted: 02/27/2017] [Indexed: 12/31/2022]
Abstract
Cells interact with biomaterials indirectly through extracellular matrix (ECM) proteins adsorbed onto their surface. Accordingly, it could be hypothesized that the surface proteomic signature of a biomaterial might determine its interaction with cells. Here, we present a surface proteomic approach to test this hypothesis in the specific case of biomaterial-epithelial cell interactions. In particular, we determined the surface proteomic signature of different biomaterials exposed to the ECM of epithelial cells (basal lamina). We revealed that the biomaterial surface chemistry determines the surface proteomic profile, and subsequently the interaction with epithelial cells. In addition, we found that biomaterials with surface chemistries closer to that of percutaneous tissues, such as aminated PMMA and aminated PDLLA, promoted higher selective adsorption of key basal lamina proteins (laminins, nidogen-1) and subsequently improved their interactions with epithelial cells. These findings suggest that mimicking the surface chemistry of natural percutaneous tissues can improve biomaterial-epithelial integration, and thus provide a rationale for the design of improved biomaterial surfaces for skin regeneration and percutaneous medical devices. STATEMENT OF SIGNIFICANCE Failure of most biomaterials originates from the inability to predict and control the influence of their surface properties on biological phenomena, particularly protein adsorption, and cellular behaviour, which subsequently results in unfavourable host response. Here, we introduce a surface-proteomic screening approach using a label-free mass spectrometry technique to decipher the adsorption profile of extracellular matrix (ECM) proteins on different biomaterials, and correlate it with cellular behaviour. We demonstrated that the way a biomaterial selectively interacts with specific ECM proteins of a given tissue seems to determine the interactions between the cells of that tissue and biomaterials. Accordingly, this approach can potentially revolutionize the screening methods for investigating the protein-cell-biomaterial interactions and pave the way for deeper understanding of these interactions.
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Terças ALG, Marques SG, Moffa EB, Alves MB, de Azevedo CMPS, Siqueira WL, Monteiro CA. Antifungal Drug Susceptibility of Candida Species Isolated from HIV-Positive Patients Recruited at a Public Hospital in São Luís, Maranhão, Brazil. Front Microbiol 2017; 8:298. [PMID: 28303122 PMCID: PMC5332371 DOI: 10.3389/fmicb.2017.00298] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 02/14/2017] [Indexed: 01/30/2023] Open
Abstract
Oropharyngeal candidiasis is the most common fungal infection in hospitalized patients with acquired immune deficiency syndrome (AIDS). Its progression results in invasive infections, which are a significant cause of morbidity and mortality. This study aimed to quickly and accurately identify Candida spp. from oral mucosa of AIDS patients recruited at Presidente Vargas Hospital, in São Luís city, Brazil and to evaluate the sensitivity profile of these fungi to antifungals by using an automated system. Isolates were collected from oropharyngeal mucosa of 52 hospitalized AIDS patients, under anti-viral and antifungal therapies. Patients were included in research if they were HIV-positive, above 18 years of age and after obtaining their written consent. CHROMagar®Candida and the automated ViteK-2®system were used to isolate and identify Candida spp., respectively. Antifungal susceptibility testing was performed using the ViteK-2®system, complemented with the Etest®, using the drugs amphotericin B, fluconazole, flucytosine, and voriconazole. Oropharyngeal candidiasis had a high prevalence in these hospitalized AIDS patients (83%), and the most prevalent species was Candida albicans (56%). Antifungal susceptibility test showed that 64.7% of the Candida spp. were susceptible, 11.8% were dose-dependent sensitive, and 23.5% were resistant. All the Candida krusei and Candida famata isolates and two of Candida glabrata were resistant to fluconazole. Most of AIDS patients presented oropharyngeal candidiasis and C. albicans was the most frequently isolated species. The results showed high variability in resistance among isolated species and indicates the need to identify the Candida spp. involved in the infection and the need to test antifungal susceptibility as a guide in drug therapy in patients hospitalized with AIDS. This is the first relate about AIDS patients monitoring in a public hospital in São Luís concerning the precise identification and establishing of antifungal profile of Candida spp..
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Affiliation(s)
- Ana L G Terças
- Department Federal Technological Teaching Center of Maranhão São Luis, Brazil
| | - Sirlei G Marques
- Nucleus of Tropical Pathology and Social Medicine, Department of Pathology, Federal University of Maranhão São Luis, Brazil
| | - Eduardo B Moffa
- Department of Post-Graduate Program in Dentistry, CEUMA UniversitySão Luis, Brazil; Department of Post-Graduate Program in Parasite Biology, CEUMA UniversitySão Luis, Brazil
| | - Márcia B Alves
- Department of Post-Graduate Program in Parasite Biology, CEUMA University São Luis, Brazil
| | | | - Walter L Siqueira
- Schulich Dentistry and Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, London ON, Canada
| | - Cristina A Monteiro
- Department of Post-Graduate Program in Parasite Biology, CEUMA University São Luis, Brazil
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Sadeghinejad L, Cvitkovitch DG, Siqueira WL, Merritt J, Santerre JP, Finer Y. Mechanistic, genomic and proteomic study on the effects of BisGMA-derived biodegradation product on cariogenic bacteria. Dent Mater 2016; 33:175-190. [PMID: 27919444 DOI: 10.1016/j.dental.2016.11.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 11/17/2016] [Accepted: 11/17/2016] [Indexed: 01/29/2023]
Abstract
OBJECTIVES Investigate the effects of a Bis-phenyl-glycidyl-dimethacrylate (BisGMA) biodegradation product, bishydroxypropoxyphenyl-propane (BisHPPP), on gene expression and protein synthesis of cariogenic bacteria. METHODS Quantitative real-time polymerase chain reaction was used to investigate the effects of BisHPPP on the expression of specific virulence-associated genes, i.e. gtfB, gtfC, gbpB, comC, comD, comE and atpH in Streptococcus mutans UA159. Possible mechanisms for bacterial response to BisHPPP were explored using gene knock-out and associated complemented strains of the signal peptide encoding gene, comC. The effects of BisHPPP on global gene and protein expression was analyzed using microarray and quantitative proteomics. The role of BisHPPP in glucosyltransferase (GTF) enzyme activity of S. mutans biofilms was also measured. RESULTS BisHPPP (0.01, 0.1mM) up-regulated gtfB/C, gbpB, comCDE, and atpH most pronounced in biofilms at cariogenic pH (5.5). The effects of BisHPPP on the constructed knock-out and complemented strains of comC from quorum-sensing system, implicated this signaling pathway in up-regulation of the virulence-associated genes. Microarray and proteomics identified BisHPPP-regulated genes and proteins involved in biofilm formation, carbohydrate transport, acid tolerance and stress-response. GTF activity was higher in BisHPPP-exposed biofilms when compared to no-BisHPPP conditions. SIGNIFICANCE These findings provide insight into the genetic and physiological pathways and mechanisms that help explain S. mutans adaptation to restorative conditions that are conducive to increased secondary caries around resin composite restorations and may provide guidance to clinicians' decision on the selection of dental materials when considering the long term oral health of patients and the interactions of composite resins with oral bacteria.
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Affiliation(s)
- Lida Sadeghinejad
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Dennis G Cvitkovitch
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Walter L Siqueira
- Schulich Dentistry and Department of Biochemistry, University of Western Ontario, London, Ontario, Canada
| | - Justin Merritt
- Department of Restorative Dentistry, School of Dentistry, Oregon Health and Science University, Portland, OR, USA
| | - J Paul Santerre
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Yoav Finer
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada.
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Sadeghinejad L, Cvitkovitch DG, Siqueira WL, Santerre JP, Finer Y. Triethylene Glycol Up-Regulates Virulence-Associated Genes and Proteins in Streptococcus mutans. PLoS One 2016; 11:e0165760. [PMID: 27820867 PMCID: PMC5098727 DOI: 10.1371/journal.pone.0165760] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 10/17/2016] [Indexed: 01/30/2023] Open
Abstract
Triethylene glycol dimethacrylate (TEGDMA) is a diluent monomer used pervasively in dental composite resins. Through hydrolytic degradation of the composites in the oral cavity it yields a hydrophilic biodegradation product, triethylene glycol (TEG), which has been shown to promote the growth of Streptococcus mutans, a dominant cariogenic bacterium. Previously it was shown that TEG up-regulated gtfB, an important gene contributing to polysaccharide synthesis function in biofilms. However, molecular mechanisms related to TEG’s effect on bacterial function remained poorly understood. In the present study, S. mutans UA159 was incubated with clinically relevant concentrations of TEG at pH 5.5 and 7.0. Quantitative real-time PCR, proteomics analysis, and glucosyltransferase enzyme (GTF) activity measurements were employed to identify the bacterial phenotypic response to TEG. A S. mutans vicK isogenic mutant (SMΔvicK1) and its associated complemented strain (SMΔvicK1C), an important regulatory gene for biofilm-associated genes, were used to determine if this signaling pathway was involved in modulation of the S. mutans virulence-associated genes. Extracted proteins from S. mutans biofilms grown in the presence and absence of TEG were subjected to mass spectrometry for protein identification, characterization and quantification. TEG up-regulated gtfB/C, gbpB, comC, comD and comE more significantly in biofilms at cariogenic pH (5.5) and defined concentrations. Differential response of the vicK knock-out (SMΔvicK1) and complemented strains (SMΔvicK1C) implicated this signalling pathway in TEG-modulated cellular responses. TEG resulted in increased GTF enzyme activity, responsible for synthesizing insoluble glucans involved in the formation of cariogenic biofilms. As well, TEG increased protein abundance related to biofilm formation, carbohydrate transport, acid tolerance, and stress-response. Proteomics data was consistent with gene expression findings for the selected genes. These findings demonstrate a mechanistic pathway by which TEG derived from commercial resin materials in the oral cavity promote S. mutans pathogenicity, which is typically associated with secondary caries.
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Affiliation(s)
- Lida Sadeghinejad
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Dennis G. Cvitkovitch
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Walter L. Siqueira
- Schulich Dentistry and Department of Biochemistry, University of Western Ontario, London, Ontario, Canada
| | - J. Paul Santerre
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Yoav Finer
- Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
- * E-mail:
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Martins Mussi MC, Moffa E, Castro T, Lira Ortega A, Freitas G, Braga M, Siqueira WL, Cury Gallottini MH. Salivary parameters and oral health in the Moebius syndrome. Spec Care Dentist 2016; 36:265-70. [PMID: 27061084 DOI: 10.1111/scd.12175] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
PURPOSE To evaluate salivary characteristics, such as flow rate, buffering capacity and amylase activity, and associate these parameters with oral health in individuals with Moebius syndrome (MS) and controls. METHODS The researchers assessed caries (ICDAS), periodontal disease (PSR), and plaque (Silness Löe) indexes in both groups. Unstimulated, stimulated, and bilateral parotid saliva were also collected. The salivary flow (milliliters/minute) and α-amylase activity were measured in all samples. The α-amylase activity was determined by maltose production. The buffering capacity was measured in stimulated saliva by titration of 0.01N HCl. RESULTS The occurrence of carious lesions, related to cut-off 2, as well as the occurrence of periodontal disease, was significantly higher (p > 0.05) in participants with MS when compared to the control group. Also, MS individuals presented decreased salivary flow, decreased buffering capacity, and amylase activity. CONCLUSIONS MS individuals present salivary alterations, which can be related to higher risk for caries.
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Affiliation(s)
- Maria Carolina Martins Mussi
- Researcher, Department of Oral Pathology and Special Patients, School of Dentistry, University of São Paulo, São Paulo, Brazil.
| | | | - Talita Castro
- PhD student, Department of Oral Pathology and Special Patients, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Adriana Lira Ortega
- Postdoctoral researcher, Department of Oral Pathology and Special Patients, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Gabrielle Freitas
- Undergraduate student, Department of Oral Pathology and Special Patients, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Mariana Braga
- Professor, Department of Pediatric Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Walter L Siqueira
- Professor, Department of Biochemistry, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Marina Helena Cury Gallottini
- Professor, Department of Oral Pathology and Special Patients, School of Dentistry, University of São aulo, São Paulo, Brazil
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Moffa EB, Izumida FE, Jorge JH, Mussi MCM, Siqueira WL, Giampaolo ET. Effectiveness of chemical disinfection on biofilms of relined dentures: A randomized clinical trial. Am J Dent 2016; 29:15-19. [PMID: 27093771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE To evaluate the effect of disinfection with sodium perborate or chlorhexidine (when combined with brushing) on the removal of biofilm in relined dentures. METHODS Swabs were collected 48 hours after the relining procedure and at the follow-up time intervals of 7, 15, 30, 90, and 180 days. The dentures' surface roughness was measured at the same times. 45 subjects were randomly divided into three groups of 15 subjects each. The control group brushed with coconut soap and a soft toothbrush. The sodium perborate group followed the same procedure and also disinfected with sodium perborate solution for 5 minutes per day. The chlorhexidine group followed the control group procedure and disinfected with 2% chlorhexidine digluconate solution for 5 minutes per day. The number of colony forming units and the surface roughness were evaluated statistically by 2-way repeated-measure ANOVA (α = 0.05). RESULTS The control group dentures exhibited similar levels of microbial cells throughout the experiment. However, after 15 days, no microbial growth was observed on the dentures for which either disinfection agent was used. There were no statistically significant differences in superficial roughness between the groups (P = 0.298). The disinfection agents used, combined with brushing, were able to remove the relined dentures' biofilm after 15 days of disinfection. Roughness was not a predominant factor in CFU reduction.
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Aboodi GM, Sima C, Moffa EB, Crosara KTB, Xiao Y, Siqueira WL, Glogauer M. Salivary Cytoprotective Proteins in Inflammation and Resolution during Experimental Gingivitis--A Pilot Study. Front Cell Infect Microbiol 2016; 5:92. [PMID: 26779447 PMCID: PMC4700204 DOI: 10.3389/fcimb.2015.00092] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 11/30/2015] [Indexed: 01/23/2023] Open
Abstract
Objective: The protective mechanisms that maintain periodontal homeostasis in gingivitis and prevent periodontal tissue destruction are poorly understood. The aim of this study was to identify changes in the salivary proteome during experimental gingivitis. Study design: We used oral neutrophil quantification and whole saliva (WS) proteomics to assess changes that occur in the inflammatory and resolution phases of gingivitis in healthy individuals. Oral neutrophils and WS samples were collected and clinical parameters measured on days 0, 7, 14, 21, 28, and 35. Results: Increased oral neutrophil recruitment and salivary cytoprotective proteins increased progressively during inflammation and decreased in resolution. Oral neutrophil numbers in gingival inflammation and resolution correlated moderately with salivary β-globin, thioredoxin, and albumin and strongly with collagen alpha-1 and G-protein coupled receptor 98. Conclusions: Our results indicate that changes in salivary cytoprotective proteins in gingivitis are associated with a similar trend in oral neutrophil recruitment and clinical parameters. Clinical relevance: We found moderate to strong correlations between oral neutrophil numbers and levels of several salivary cytoprotective proteins both in the development of the inflammation and in the resolution of gingivitis. Our proteomics approach identified and relatively quantified specific cytoprotective proteins in this pilot study of experimental gingivitis; however, future and more comprehensive studies are needed to clearly identify and validate those protein biomarkers when gingivitis is active.
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Affiliation(s)
- Guy M Aboodi
- Department of Periodontology and Matrix Dynamics Group, Faculty of Dentistry, University of Toronto Toronto, ON, Canada
| | - Corneliu Sima
- Department of Periodontology and Matrix Dynamics Group, Faculty of Dentistry, University of Toronto Toronto, ON, Canada
| | - Eduardo B Moffa
- Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, The University of Western OntarioLondon, ON, Canada; Department of Prosthodontics, CEUMA UniversitySao Luis, Brazil
| | - Karla T B Crosara
- Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, The University of Western Ontario London, ON, Canada
| | - Yizhi Xiao
- Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, The University of Western Ontario London, ON, Canada
| | - Walter L Siqueira
- Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, The University of Western Ontario London, ON, Canada
| | - Michael Glogauer
- Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, The University of Western Ontario London, ON, Canada
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Walton DM, Elliott J, Lee J, Loh E, MacDermid J, Schabrun S, Siqueira WL, Corneil BD, Aal B, Birmingham T, Brown A, Cooper L, Dickey JP, Dixon SJ, Fraser D, Gati J, Gloor G, Good G, Holdsworth D, McLean SA, Millard W, Miller J, Sadi J, Seminowicz DA, Shoemaker JK, Siegmund G, Versteegh T, Wideman TH. Research priorities in the field of post-traumatic pain and disability: Results of a transdisciplinary consensus-generating workshop. Pain Res Manag 2015:17143. [PMID: 26583461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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Affiliation(s)
- Rebecca H. Affoo
- Graduate Program of Health and Rehabilitation Sciences; Western University; London ON Canada
| | - Norine Foley
- Brescia University College; Western University; London ON Canada
| | - Rushlee Garrick
- Department of Psychology; Western University; London ON Canada
| | - Walter L. Siqueira
- Schulich School of Medicine and Dentistry; Western University; London ON Canada
| | - Ruth E. Martin
- Graduate Program of Health and Rehabilitation Sciences; Western University; London ON Canada
- Department of Physiology and Pharmacology; Western University; London ON Canada
- School of Communication Sciences and Disorders; Western University; London ON Canada
- Department of Otolaryngology; Western University; London ON Canada
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Moffa EB, Mussi MCM, Xiao Y, Garrido SS, Machado MAAM, Giampaolo ET, Siqueira WL. Histatin 5 inhibits adhesion of C. albicans to Reconstructed Human Oral Epithelium. Front Microbiol 2015; 6:885. [PMID: 26379655 PMCID: PMC4551819 DOI: 10.3389/fmicb.2015.00885] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 08/12/2015] [Indexed: 11/30/2022] Open
Abstract
Candida albicans is the most pathogenic fungal species, commonly colonizing on human mucosal surfaces. As a polymorphic species, C. albicans is capable of switching between yeast and hyphal forms, causing an array of mucosal and disseminated infections with high mortality. While the yeast form is most commonly associated with systemic disease, the hyphae are more adept at adhering to and penetrating host tissue and are therefore frequently observed in mucosal fungal infections, most commonly oral candidiasis. The formation of a saliva-derived protein pellicle on the mucosa surface can provide protection against C. albicans on oral epithelial cells, and narrow information is available on the mucosal pellicle composition. Histatins are one of the most abundant salivary proteins and presents antifungal and antibacterial activities against many species of the oral microbiota, however, its presence has never been studied in oral mucosa pellicle. The objective of this study was to evaluate the potential of histatin 5 to protect the Human Oral Epithelium against C. albicans adhesion. Human Oral Epithelial Tissues (HOET) were incubated with PBS containing histatin 5 for 2 h, followed by incubation with C. albicans for 1 h at 37°C. The tissues were then washed several times in PBS, transferred to fresh RPMI and incubated for 16 h at 37°C at 5% CO2. HOET were then prepared for histopathological analysis using light microscopy. In addition, the TUNEL assay was employed to evaluate the apoptosis of epithelial cells using fluorescent microscopy. HOET pre-incubated with histatin 5 showed a lower rate of C. albicans growth and cell apoptosis when compared to the control groups (HOET alone and HOET incubated with C. albicans). The data suggest that the coating with histatin 5 is able to reduce C. albicans colonization on epithelial cell surfaces and also protect the basal cell layers from undergoing apoptosis.
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Affiliation(s)
- Eduardo B Moffa
- The University of Western Ontario - Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, London, ON Canada ; Department of Dental Materials and Prosthodontics, Araraquara Dental School - Universidade Estadual Paulista, São Paulo Brazil
| | - Maria C M Mussi
- The University of Western Ontario - Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, London, ON Canada ; School of Dentistry, University of São Paulo, São Paulo Brazil
| | - Yizhi Xiao
- The University of Western Ontario - Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, London, ON Canada
| | - Saulo S Garrido
- Department of Biochemistry and Technological Chemistry - Institute of Chemistry - Universidade Estadual Paulista, São Paulo Brazil
| | - Maria A A M Machado
- Department of Pediatric Dentistry, Orthodontics and Public Health, Bauru Dental School, University of São Paulo, Bauru Brazil
| | - Eunice T Giampaolo
- Department of Dental Materials and Prosthodontics, Araraquara Dental School - Universidade Estadual Paulista, São Paulo Brazil
| | - Walter L Siqueira
- The University of Western Ontario - Department of Biochemistry and Schulich Dentistry, Schulich School of Medicine and Dentistry, London, ON Canada
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Kobayashi CAN, Leite AL, Peres-Buzalaf C, Carvalho JG, Whitford GM, Everett ET, Siqueira WL, Buzalaf MAR. Bone response to fluoride exposure is influenced by genetics. PLoS One 2014; 9:e114343. [PMID: 25501567 PMCID: PMC4263599 DOI: 10.1371/journal.pone.0114343] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 11/06/2014] [Indexed: 12/12/2022] Open
Abstract
Genetic factors influence the effects of fluoride (F) on amelogenesis and bone homeostasis but the underlying molecular mechanisms remain undefined. A label-free proteomics approach was employed to identify and evaluate changes in bone protein expression in two mouse strains having different susceptibilities to develop dental fluorosis and to alter bone quality. In vivo bone formation and histomorphometry after F intake were also evaluated and related to the proteome. Resistant 129P3/J and susceptible A/J mice were assigned to three groups given low-F food and water containing 0, 10 or 50 ppmF for 8 weeks. Plasma was evaluated for alkaline phosphatase activity. Femurs, tibiae and lumbar vertebrae were evaluated using micro-CT analysis and mineral apposition rate (MAR) was measured in cortical bone. For quantitative proteomic analysis, bone proteins were extracted and analyzed using liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS), followed by label-free semi-quantitative differential expression analysis. Alterations in several bone proteins were found among the F treatment groups within each mouse strain and between the strains for each F treatment group (ratio ≥1.5 or ≤0.5; p<0.05). Although F treatment had no significant effects on BMD or bone histomorphometry in either strain, MAR was higher in the 50 ppmF 129P3/J mice than in the 50 ppmF A/J mice treated with 50 ppmF showing that F increased bone formation in a strain-specific manner. Also, F exposure was associated with dose-specific and strain-specific alterations in expression of proteins involved in osteogenesis and osteoclastogenesis. In conclusion, our findings confirm a genetic influence in bone response to F exposure and point to several proteins that may act as targets for the differential F responses in this tissue.
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Affiliation(s)
- Cláudia A. N. Kobayashi
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Aline L. Leite
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | | | - Juliane G. Carvalho
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Gary M. Whitford
- Department of Oral Biology, College of Dental Medicine, Georgia Regents University, Augusta, Georgia, United States
| | - Eric T. Everett
- Department of Pediatric Dentistry, The Carolina Center for Genome Sciences, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina, United States
| | - Walter L. Siqueira
- Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Marília A. R. Buzalaf
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
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Vukosavljevic D, Hutter JL, Helmerhorst EJ, Xiao Y, Custodio W, Zaidan FC, Oppenheim FG, Siqueira WL. Nanoscale adhesion forces between enamel pellicle proteins and hydroxyapatite. J Dent Res 2014; 93:514-9. [PMID: 24591293 DOI: 10.1177/0022034514526599] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The acquired enamel pellicle (AEP) is important for minimizing the abrasion caused by parafunctional conditions as they occur, for instance, during bruxism. It is a remarkable feature of the AEP that a protein/peptide film can provide enough protection in normofunction to prevent teeth from abrasion and wear. Despite its obvious critical role in the protection of tooth surfaces, the essential adhesion features of AEP proteins on the enamel surface are poorly characterized. The objective of this study was to measure the adhesion force between histatin 5, a primary AEP component, and hydroxyapatite (HA) surfaces. Both biotinylated histatin 5 and biotinylated human serum albumin were allowed to adsorb to streptavidin-coated silica microspheres attached to atomic force microscope (AFM) cantilevers. A multimode AFM with a Nanoscope IIIa controller was used to measure the adhesion force between protein-functionalized silica microspheres attached to cantilever tips and the HA surface. The imaging was performed in tapping mode with a Si3N4 AFM cantilever, while the adhesion forces were measured in AFM contact mode. A collection of force-distance curves (~3,000/replicate) was obtained to generate histograms from which the adhesion forces between histatin 5 or albumin and the HA surface were measured. We found that histatin 5 exhibited stronger adhesion forces (90% >1.830 nN) to the HA surface than did albumin (90% > 0.282 nN). This study presents an objective approach to adhesion force measurements between histatin 5 and HA, and provides the experimental basis for measuring the same parameters for other AEP constituents. Such knowledge will help in the design of synthetic proteins and peptides with preventive and therapeutic benefits for tooth enamel.
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Affiliation(s)
- D Vukosavljevic
- Schulich School of Medicine & Dentistry, The University of Western Ontario, London, ON N5A 6C1, Canada
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McCann MR, Patel P, Beaucage KL, Xiao Y, Bacher C, Siqueira WL, Holdsworth DW, Dixon SJ, Séguin CA. Acute vibration induces transient expression of anabolic genes in the murine intervertebral disc. ACTA ACUST UNITED AC 2013; 65:1853-64. [PMID: 23661269 DOI: 10.1002/art.37979] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Accepted: 04/11/2013] [Indexed: 01/07/2023]
Abstract
OBJECTIVE Low-amplitude whole-body vibration has been adopted for the treatment of back pain and spinal disorders. However, there is limited knowledge of the impact of vibration on the intervertebral disc (IVD). This study was undertaken to examine the effects of acute vibration on anabolic and catabolic pathways in the IVD and to characterize the dependence of these changes on time and frequency. METHODS Custom-designed platforms were developed to apply acute vibration to ex vivo and in vivo mouse models. Spinal segments (ex vivo) or mice (in vivo) were subjected to vibration (for 30 minutes at 15-90 Hz with peak acceleration at 0.3g), and IVDs were examined at specific time points after vibration. Gene expression was quantified using real-time polymerase chain reaction, and protein levels were examined by quantitative mass spectrometry and immunofluorescence. RESULTS In the ex vivo model, acute vibration at 15 Hz induced expression of anabolic genes (aggrecan, biglycan, decorin, type I collagen, and Sox9) and suppressed expression of Mmp13, with the most pronounced changes detected 6 hours following vibration. These beneficial effects were frequency dependent and were no longer evident between 45 and 90 Hz. In vivo, the effects on anabolic gene expression were even more robust and were accompanied by decreased expression of Adamts4, Adamts5, and Mmp3. Moreover, significant increases in the protein levels of aggrecan, biglycan, decorin, and type I collagen were detected in vivo. CONCLUSION These findings demonstrate dramatic anabolic effects of acute vibration on IVD tissue, responses that are dependent on frequency. The similarity of the in vivo and ex vivo responses indicates that at least some effects of vibration are tissue autonomous.
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Affiliation(s)
- Matthew R McCann
- Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, Canada
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